Is the Church Against Science?

Inventing a narrative: Draper and White

The portrayal of the Church as the enemy of science was not born in Antiquity or the Middle Ages: it was invented in the nineteenth century by two Anglo-American authors — a Briton settled in the United States and an American — in two precise polemical contexts.

John William Draper (1811-1882), a British chemist and historian settled in the United States, published in 1874 History of the Conflict Between Religion and Science^[2]. The work appeared in the aftermath of the First Vatican Council (1870) and the definition of the dogma of papal infallibility. Draper, hostile to Catholicism, presents the entire history of Western civilisation as a permanent war between free reason and clerical superstition. His angle is deliberately anti-Catholic: he relatively spares Protestantism.

Andrew Dickson White (1832-1918), co-founder of Cornell University, first delivered the lecture "The Battle-Fields of Science" (December 1869, Cooper Union, New York), published The Warfare of Science in 1876, then expanded the argument into two volumes in A History of the Warfare of Science with Theology in Christendom (1896)^[3]. White was facing religious critics who accused him of wanting to found a university without theological teaching. His "conflict thesis" served as his institutional justification.

"The history of Science is not a mere record of isolated discoveries; it is a narrative of the conflict of two contending powers, the expansive force of the human intellect on one side, and the compression arising from traditionary faith and human interests on the other." — John William Draper, History of the Conflict Between Religion and Science, D. Appleton & Co., New York, 1874, Preface^[4]

These two works have real rhetorical quality and an impressive appearance of erudition. They profoundly shaped popularisation for more than a century. Yet their theses have been dismantled by historians since the 1970s.

Dismantled by modern historiography

David C. Lindberg and Ronald L. Numbers coordinated in 1986 God and Nature: Historical Essays on the Encounter Between Christianity and Science, published by the University of California Press^[5]. The conclusion of these essays, written by specialists of different periods, is unambiguous: the relationship between science and Christianity "was far too complex and rich to be summarised by the simplistic formula of conflict".

Ronald Numbers edited in 2009 Galileo Goes to Jail and Other Myths about Science and Religion, Harvard University Press — 25 chapters refuting 25 specific myths^[6]. Among the legends dismantled: "the Church forbade autopsies in the Middle Ages" (false), "Christianity destroyed Greek science" (false), "the medieval Church suppressed the natural sciences" (false), "Galileo was imprisoned in a dungeon and tortured" (false).

"Only in the last thirty years of the twentieth century have historians of science mounted a sustained attack on the thesis and only gradually has a wider public begun to recognize its deficiencies." — Colin A. Russell, "The Conflict of Science and Religion", in Gary B. Ferngren (ed.), Science and Religion: A Historical Introduction, Johns Hopkins University Press, Baltimore, 2002^[7]

Peter Harrison, in The Territories of Science and Religion (University of Chicago Press, 2015)^[8], demonstrates something more fundamental: the very concepts of "science" and "religion" as we understand them today are nineteenth-century constructions. By projecting these anachronistic categories onto the Middle Ages and the Renaissance, Draper and White created an opposition that did not exist as such for the historical actors.

Lawrence Principe, chemist and historian of science at Johns Hopkins, estimates that the Catholic Church was probably the largest and most enduring patron of science in all of history^[9]. John Heilbron, of the University of Berkeley, establishes in his study of cathedrals used as solar observatories that the Catholic Church gave astronomy, for more than six centuries, greater financial and social support than any other institution^[10].

Why the myth persists

The conflict myth is convenient for two symmetrical camps: the scientistic thinkers who want to set science against faith, and certain conservative religious voices who denounce science as human pride. It caricatures both sides — a heroic martyred science, an obscurantist religion — and benefits those who want to reduce questions of meaning to a turf war.

Serious historiography breaks with this double caricature. The real history is more interesting: a fruitful alliance, crossed by real tensions, but fundamentally different from the clash of civilisations that Draper and White invented.

The first universities: ecclesial foundations

The first European universities were born in a Christian context, and often thanks to papal bulls that conferred on them their legal status and autonomy.

Bologna (1088) developed around the study of Roman law — the rediscovery of Justinian's texts generated an urgent need for competent masters. Emperor Frederick Barbarossa's Authentica Habita (1158) granted it privileges, but the first decades of organised teaching took place within the context of the pre-existing cathedral schools^[16].

Paris received its first royal charter from Philip Augustus (15 January 1200), but it is Pope Gregory IX's bull Parens Scientiarum (1231) that enshrined its autonomy and earned it the nickname "Magna Carta of the universities"^[17]. In August 1215, the cardinal legate Robert de Courson, in the name of Innocent III, had already officially organised studies by a detailed charter.

Oxford (from the 12th century) and Cambridge (1209) developed in a similar framework. Padua (1222), founded by professors and students from Bologna seeking independence, extended its teaching to medicine and natural philosophy from the 1260s. Toulouse (1229) was born in the Treaty of Paris ending the Albigensian Crusade: Count Raymond VII had to fund 14 professors in four faculties, including theology^[18].

The verdict of the Encyclopædia Universalis is clear: "It is to pontifical support that the universities owe having won their independence"^[19]. From 1179, the Chancellor of Notre-Dame of Paris issued the licentia docendi — the licence to teach — and pontifical legates played a decisive role in structuring these institutions.

What these universities taught

About 30% of medieval university programmes covered subjects relating to the natural world^[20]: logic, arithmetic, geometry, astronomy (the seven liberal arts), then natural philosophy, medicine. Intense debates on Aristotle, optics, motion, mathematics and cosmology trained generations of minds. This is not mere transmission — it is a culture of rational disputation, precise distinctions, proof.

Against a far too widespread opinion, the enthusiasm of medieval intellectuals for reason is well documented^[21].

This intellectual freedom had limits, but in practice they remained narrow. The historian William J. Courtenay notes that between the 13th and 15th centuries, the university recognised work carried out by thinkers of differing beliefs, loyally set out opposing positions before discussing them, and left masters of theology with an authority over course content often greater than that of bishops or even the pope himself^[22]. Over the whole Middle Ages, Lütz records about fifty attempted heresy trials brought against professors — "most of them, moreover, coming to nothing"^[23]. Fifty proceedings in three centuries, across the whole of university Europe, for tens of thousands of masters and students: the figure speaks of the exception, not the rule.

The Pontifical Academy of Sciences (1603)

The Accademia dei Lincei (Academy of the Lynxes — the animal symbolising keen vision) was founded on 17 August 1603 by Prince Federico Cesi^[24]. It is Europe's first scientific academy — earlier than the Royal Society of London (1660) and the Royal Academy of Sciences of Paris (1666). Galileo became its 6th member in 1611.

After vicissitudes, Pius IX restored it in 1847 (Pontificia Accademia dei Nuovi Lincei). Pius XI gave it its present form through the motu proprio In multis solaciis (28 October 1936)^[25]: 80 international academicians, elected on scientific merit, whatever their religious confession — the original membership counted 80 academicians of whom 70 were appointed for life, a number raised to 80 life members by John Paul II in 1986^[26]. From 1937, the first members included Nobel Prize winners and non-Catholic scholars — Orthodox, Lutheran mathematicians, and the Jewish mathematician Tullio Levi-Civita, appointed in 1936, two years before the fascist racial laws of 1938^[27].

"To you, noble champions of human arts and disciplines, the Church acknowledges the just freedom of method and inquiry." — Pius XII, address to the plenary session of the Pontifical Academy of Sciences, 3 December 1939 (Ignispedia translation from the official Italian text: "la giusta libertà del metodo e dell'indagine")^[28]

The current president (since 2017) is Joachim von Braun, a German economist and agronomist, a Lutheran. This institution, seated in the Casina Pio IV in the heart of the Vatican gardens, refutes by its very existence the thesis of a Rome structurally hostile to scientific research.

These names are not decorative exceptions added after the fact to a history supposedly alien to the Church. They belong to the very fabric of Western science: universities, religious orders, observatories, monasteries, academies and scholarly networks often served as the concrete settings of research.

Roger Bacon and the experimental method

Roger Bacon (c. 1214/1220-1292) entered the Franciscan Order around 1256. In response to a commission from Pope Clement IV (22 June 1266), he wrote his Opus Maius, Opus Minus and Opus Tertium — three treatises sent directly to the pope around 1267-1268^[29]. The Opus Maius in seven parts covers optics, mathematics, natural philosophy and experimental science. Its founding formula has remained famous:

"Without experience, nothing can be known adequately." — Roger Bacon, O.F.M., Opus Maius, part VI (De Scientia Experimentali), c. 1267-1268^[30]

Bacon is one of the fathers of the experimental method — and he is a Franciscan writing for a pope.

Albertus Magnus and the study of nature

Albertus Magnus (c. 1200-1280), Dominican and bishop, was canonised in 1931 by Pius XI, who declared him a Doctor of the Church. In 1941 he was declared patron of natural scientists^[31]. His corpus of more than 40 works includes detailed commentaries on Aristotle and original treatises on botany, mineralogy, zoology, astronomy, meteorology and chemistry. He "established the study of nature as a legitimate science within the Christian tradition"^[32].

Nicolaus Copernicus, canon

Nicolaus Copernicus (1473-1543) served as canon at Frauenburg (Frombork, Poland). His manuscript De revolutionibus orbium coelestium was completed around 1530. In 1533, his heliocentric hypothesis was already known as far as Pope Clement VII — who listened to it with interest^[33]. Cardinal Schönberg and Bishop Giese pressed Copernicus to publish. He dedicated the work to Pope Paul III. Copernicus was never troubled in his lifetime^[34]. The work was placed on the Index only 73 years after his death, in March 1616 — as an indirect measure against Galileo, who was mixing heliocentrism with biblical exegesis. The bans were lifted in three stages: in 1741, Benedict XIV had the imprimatur granted to the first edition of Galileo's complete works, including an expurgated version of the Dialogue; in 1757, the general ban on heliocentrist works was removed from the Index (1758 edition), with only the expressly condemned titles remaining; in 1835, these last titles were in turn removed from the printed Index.

The 1543 frontispiece recalls a fact often forgotten: the founding book of modern heliocentrism appeared with a dedication to Pope Paul III, not as an anti-Christian manifesto.

Nicolaus Steno, bishop founder of geology

Nicolaus Steno (Niels Stensen, 1638-1686) was born Lutheran in Copenhagen. He converted to Catholicism in Florence in 1667 after comparative studies. His Prodromus (1669), preface to a dissertation on Tuscany, established three great principles that still found modern stratigraphy^[35]: the principle of superposition (upper layers are younger), the principle of original horizontality, and the principle of lateral continuity of layers. He is regarded as the founder of geology and one of the fathers of palaeontology. Ordained priest in 1675, he became bishop and vicar apostolic for northern Europe in 1677. John Paul II beatified him on 23 October 1988^[36].

Gregor Mendel, monk and father of genetics

Gregor Mendel (1822-1884) received the name "Gregor" on entering the Order of Saint Augustine at the Saint Thomas monastery of Brno (Moravia). He became its abbot. Between 1856 and 1863, his experiments on thousands of pea plants in the monastery garden established the laws of heredity. He published his work in 1866: Versuche über Pflanzenhybriden (Experiments on Plant Hybrids)^[37]. The importance of his work was recognised only in 1900, when Hugo de Vries, Carl Correns and Erich von Tschermak independently rediscovered it. The Augustinian abbot who worked in a monastery garden is the founder of genetics.

The Jesuits and astronomy: 35 lunar craters

The Society of Jesus (founded 1540) integrated the sciences into its Ratio Studiorum (plan of studies) very early. Christopher Clavius (1538-1612), Jesuit, was the principal architect of the Gregorian calendar reform (1582)^[38]. Giovanni Riccioli (1598-1671) established the nomenclature of the visible face of the Moon still used today^[39]. Roger Boscovich (1711-1787), a Croatian Jesuit, formulated a theory of atomic forces that would anticipate modern physics. The Jesuit Joseph MacDonnell counts 35 lunar craters bearing the names of Jesuit scholars^[40] — a record unmatched by any other religious or secular institution.

Abbot Spallanzani and microbiology

Lazzaro Spallanzani (1729-1799), ordained priest in 1762, nicknamed "Abbot Spallanzani", refuted spontaneous generation through experiments on sterilised broths — anticipating Louis Pasteur by a century^[41]. He demonstrated that fertilisation requires material contact between spermatozoon and ovum, and studied bat echolocation.

Abbot Breuil, pope of Prehistory

Henri Breuil (1877-1961), ordained priest in June 1900 at the Saint-Sulpice seminary, was nicknamed "the pope of Prehistory"^[42]. A specialist in prehistoric cave art (Lascaux, Altamira), he obtained in 1929 a chair of Prehistory at the Collège de France, which he held until 1947.

Precise chronology of the facts

The real reasons for the condemnation

The Galileo trial (1633) is often understood as a condemnation of heliocentrism by an irrational Church. The reality is more precise and more nuanced.

First factor — legal: in 1616 Galileo had received Cardinal Bellarmine's formal injunction not to "hold, defend or teach" heliocentrism. His Dialogue Concerning the Two Chief World Systems (1632) clearly violates this injunction, presenting heliocentrism as "the better of the two systems" behind a veil of fictitious neutrality^[43].

Second factor — personal and political: since 1624 Galileo had enjoyed the protection of Pope Urban VIII (Maffeo Barberini), a personal friend and admirer. The Dialogue openly ridicules the geocentric position through the character of Simplicio — a character the pontifical court identifies with Urban VIII himself. The pope feels betrayed and deceived^[44].

Third factor — hermeneutical: Galileo was attempting not only to defend heliocentrism as a scientific hypothesis, but to reinterpret Holy Scripture to make it compatible with the Copernican system. In the context of the Counter-Reformation, touching the interpretation of Scripture without theological authority was mined terrain.

Fourth factor — epistemic: in 1633, Galileo did not yet have decisive physical proofs of heliocentrism. Stellar parallax — the direct proof of the Earth's motion — would only be observed in 1838 by Friedrich Wilhelm Bessel. The tidal argument Galileo put forward was in fact mistaken^[45].

Legend vs reality

Several elements of the popular legend are historically false:

• Galileo was not tortured. He was subjected to the threat of torture (standard legal procedure of the time), but this threat was never carried out^[46].
• Galileo was not imprisoned in a dungeon. During the interrogations, he resided in a luxurious apartment in the palace of the Tuscan embassy in Rome (Villa Medici). His final house arrest took place in his rented villa at Arcetri (Il Gioiello, rented since September 1631), where he could continue his work and receive visitors — including the young Milton in 1638^[47].
• "E pur si muove" (And yet it moves) is a legend. This phrase, attributed to Galileo after his abjuration, is mentioned in no contemporary source of the trial and appears only in the 18th century, in 1757 in a work by Giuseppe Baretti^[48].

As the classic study by Arthur Koestler on the astronomical revolution establishes, whose synthesis Manfred Lütz takes up here, the Inquisition did not torture Galileo, who languished in no dungeon, never uttered the famous "and yet it moves" and was no martyr of science either^[49].

Galileo himself had anticipated the correct Catholic answer to the apparent conflict between Scripture and science:

"If Scripture cannot err, some of its interpreters and commentators can, and in several ways." — Galileo Galilei, Letter to Benedetto Castelli (1613), quoted by John Paul II, Address to the Pontifical Academy of Sciences, 31 October 1992^[50]

The recognition by John Paul II (1992)

On 31 October 1992, at the end of eleven years of work by the study commission constituted on 3 July 1981, whose concluding phase Cardinal Paul Poupard coordinated, John Paul II formally acknowledged the error before the Pontifical Academy of Sciences:

"The majority of theologians did not perceive the formal distinction between Sacred Scripture and its interpretation, which led them unduly to transpose into the domain of the doctrine of the faith a question of fact falling within scientific investigation." — John Paul II, Address to the Pontifical Academy of Sciences, 31 October 1992, § 9^[51]

"The error of the theologians of that time, when they maintained the centrality of the earth, was to think that our knowledge of the structure of the physical world was, in a certain way, imposed by the literal sense of Sacred Scripture." — John Paul II, Address to the Pontifical Academy of Sciences, 31 October 1992, § 12^[52]

This recognition is significant because it identifies the precise error: not an intrinsic conflict between science and faith, but a methodological confusion — theologians who had mixed the interpretation of Scripture with a question of astronomy that eluded them.

The Galileo trial is not the only accusation weighing on the Church in the collective imagination. The witch hunts of the 15th-17th centuries often function as a second example supposed to prove the hostility of "the Church" to all rational thought. Recent historiography — synthesised notably by the German historian Wolfgang Behringer, the reference specialist on the subject — paints a much more complex picture, in which popular responsibility, secular justice and ecclesiastical institutions are not to be confused.

Medieval theological scepticism about magic

Long before the great waves of trials of the 16th-17th centuries, the most authoritative medieval theology already treated belief in the supernatural powers of witches as an illusion. The Canon episcopi, a 10th-century canonical text widely circulated in the medieval West, places accounts of nocturnal rides in the "realm of imagination" — a "hallucination", not a real phenomenon^[53]. Wolfgang Behringer thus sums up the practical consequence of this doctrinal caution: the doubts of early Christians about the real efficacy of magical practices durably restrained any desire for persecution^[54].

This theological reserve did not prevent local popular lynchings: belief in witchcraft remained vivid in the countryside, and the population in places began to "take justice into its own hands"^[55]. But it explains why the institutional Church of the early Middle Ages organised no systematic persecution — unlike the private treatise of the Dominican Kramer illustrated here, which invoked an approval from the Cologne faculty of theology whose authenticity is debated among historians^[56].

The Spanish Inquisition, a brake rather than an engine

The best-documented centre of the witch hunts lies in fact in Germanic central Europe, in the 16th and 17th centuries, under most often secular and local jurisdictions — principalities, free cities, seigneurial courts. The Spanish Inquisition, a centralised ecclesiastical institution often presented as the archetype of Catholic repression, followed the reverse trajectory: Behringer indicates that it had first taken part in the persecution of witches before curbing their repression from 1526^[57]. The historian Henry Kamen, specialist of the Spanish Inquisition, draws from this record a conclusion directly opposed to the legend: this tribunal on the contrary energetically put an end to a superstition which, in other countries, claimed more victims than any other wave of religious fanaticism^[58].

This finding joins the one already established on the complete archives of the Spanish Inquisition: in this matter as in others, the tribunal restrained rather than fuelled repression.

Theologians and ecclesiastical courts facing secular law

One of the most useful contributions of recent historiography is to distinguish where the great waves of trials really arose:

"All these ideas were not born in the universities; they fermented within the population, which challenged the Church as well as the State. If theologians and ecclesiastical courts showed reserve or opposed them, secular law lent them an attentive ear." — Manfred Lütz, Le christianisme en procès, Éditions Emmanuel, Paris, 2019, p. 154^[59]

This distinction does not fully exonerate local Catholic authorities, who took part in places and at certain periods in proceedings against persons accused of witchcraft. But it forbids treating "the Church" as a homogeneous bloc in this matter: the pressure came mostly from popular fear and civil jurisdictions, while ecclesiastical courts and theology faculties were rather among the most reserved voices.

An order of magnitude, not millions

The number of victims of the witch hunts was long inflated to several million in some 20th-century militant accounts. The most serious historical research brings this figure back to a quite different scale: the Danish researcher Gustav Henningsen estimates at 50,000 the total number of victims for the whole of Europe, of whom about 25,000 in Germany and neighbouring regions — Catholics and Protestants alike^[60]. This last point deserves emphasis: the most intense persecutions affected territories of both confessions, which contradicts an account making the Catholic Church alone exclusively responsible for the phenomenon.

Biography of a priest-scholar

Georges Lemaître was born on 17 July 1894 in Charleroi, Belgium. He interrupted his civil engineering studies to fight as an artillery officer during the First World War. Doctor of science (pure mathematics) at the Catholic University of Louvain in 1920, he then entered the Malines seminary and was ordained priest in 1923^[61]. He then trained at Cambridge under Arthur Eddington (1923-1924), then at Harvard and MIT, where he defended a second doctorate in 1927.

The 1927 article and the expansion law

In 1927, Lemaître published in the Annales de la Société Scientifique de Bruxelles a decisive article^[62]: he established that galaxies move away from one another according to a linear relation between recession velocity and distance. This relation would be "rediscovered" and published by Edwin Hubble in 1929 under the name "Hubble's law". In 2018, the International Astronomical Union recommended renaming this relation the Hubble-Lemaître law, recognising the priority of the Belgian priest^[63].

At a seminar at Caltech in January 1933, after hearing Lemaître expound his theory before Einstein himself, the German physicist is said to have risen to declare publicly: "This is the most beautiful and satisfactory explanation of creation to which I have ever listened"^[64]. Einstein, long reluctant towards the idea of an expanding universe, would end up acknowledging that his own "cosmological constant" — introduced in 1917 to maintain a static universe — was his "greatest blunder".

The primeval atom hypothesis (1931)

In May 1931, Lemaître published in the journal Nature a four-paragraph note proposing that the Universe had expanded from an initial "primeval atom" — the direct ancestor of what would be called the Big Bang^[65]. He developed this hypothesis in his work L'Hypothèse de l'atome primitif (1946).

Refusing concordism: Lemaître against Pius XII

On 22 November 1951, Pius XII delivered before the Pontifical Academy of Sciences the address "Fiat Lux", in which he drew a parallel between Big Bang theory and the Christian doctrine of creatio ex nihilo^[66]. This enthusiastic concordism alarmed Lemaître, who was not present. The priest-scholar obtained an audience with the pope before an address scheduled in 1952 to the International Astronomical Union meeting in Rome, and convinced Pius XII to delete the passages that used the Big Bang as proof of God's existence^[67].

Lemaître's philosophical position was firm: science and faith are like two "parallel lines" that never meet — an image given here as a paraphrase of his thought, not as a quotation from Lemaître^[68]. Using Big Bang theory as apologetic proof is both bad science and bad theology — for a future scientific discovery could invalidate that argument, and faith does not need to be propped up by physics to be reasonable. As early as 1933, Lemaître formulated this conviction in a famous interview:

"There are two ways of arriving at the truth. I decided to follow them both." — Georges Lemaître, remarks reported by Duncan Aikman, "Lemaître Follows Two Paths to Truth", The New York Times Magazine, 19 February 1933, p. 3^[69]

"Once you realize that the Bible does not purport to be a textbook of science, the old controversy between religion and science vanishes." — Georges Lemaître, same interview, The New York Times Magazine, 19 February 1933, p. 18^[70]

Having become president of the Pontifical Academy of Sciences in 1960 (appointed by John XXIII with the title of domestic prelate), Lemaître embodied until his death in 1966 the figure of the believing scholar who refuses both artificial opposition and naive concordism.

Gaudium et Spes §36: the legitimate autonomy of earthly realities

In 1965, the Second Vatican Council formulated, in the pastoral constitution Gaudium et Spes, a position that is the heart of Catholic doctrine on the sciences:

"If by the autonomy of earthly realities is meant that created things and societies themselves have their own laws and values, which man must gradually learn to know, to use and to organise, such a requirement of autonomy is fully legitimate [...] That is why methodical research, in every branch of knowledge, if it is carried out in a truly scientific manner and follows moral norms, will never really be opposed to faith: profane realities and those of faith find their origin in the same God." — Second Vatican Council, Pastoral Constitution Gaudium et Spes, 7 December 1965, § 36^[71]

This text clearly distinguishes two types of autonomy:

• Legitimate autonomy: created realities have their own laws; methodical science is not opposed to faith — for God is at the origin of both orders of knowledge.
• Illegitimate autonomy: to affirm that creatures are independent of God would be an ontological absurdity — "the creature without the Creator vanishes".

§36 also implicitly acknowledges past errors: the Council itself deplores there "certain attitudes which have existed among Christians themselves, insufficiently aware of the legitimate autonomy of science".

Humani Generis §§36-37: evolution and the human soul (Pius XII, 1950)

In 1950 Pius XII settled a question many thought explosive:

"That is why the magisterium of the Church does not forbid the doctrine of 'evolution', insofar as it investigates the origin of the human body from pre-existing and living matter — for the Catholic faith obliges us to hold to the immediate creation of souls by God — from being, in the present state of science and theology, the object of inquiry and debate among scholars of both parties [...]" — Pius XII, Encyclical Humani Generis, 12 August 1950, § 36^[72]

This formulation is remarkable: the question of the evolution of the human body is not condemned — it is open to scientific inquiry. What the Catholic faith requires is the immediate creation of the soul by God — which is not a claim of biology, but of metaphysical anthropology.

§37, on the other hand, condemns polygenism (the idea that humanity descends from several independent original couples), because it would make the doctrine of original sin transmitted from a common ancestor unintelligible^[73].

John Paul II in 1996: "more than a hypothesis"

Before reading this sentence, one must know what one is reading. On 22 October 1996, John Paul II did not deliver an address to the Pontifical Academy of Sciences: he sent it a written message. The Holy See itself classifies it among messages (the "pont_messages/1996" file on vatican.va), whereas the allocutions actually delivered before the same Academy, in 1992 and in 2000, are filed among addresses; the text ends like a letter, "From the Vatican, 22 October 1996"; and the pope had undergone an appendectomy on 8 October 1996, two weeks before the plenary assembly — the Centre d'Étude et de Prospective sur la Science (CEP) maintains that the planned audience was cancelled and that the pope did not receive the academicians^[74]. This takes nothing away from the document's authenticity: the sentence exists, in French, on the Holy See's website, in a message signed "IOANNES PAULUS PP. II". But it says exactly what it weighs: a written message to a scientific academy, the lowest degree of pontifical teaching — neither encyclical, nor constitution, nor doctrinal act — which teaches nothing new in matters of faith and recalls Humani Generis.

Forty-six years after Humani Generis, the passage everyone quotes is this one:

"Today, almost half a century after the publication of the encyclical, new knowledge leads to the recognition of more than a hypothesis in the theory of evolution." — John Paul II, Message to the Pontifical Academy of Sciences, 22 October 1996, § 4^[75]

He specifies the criterion for this changed assessment:

"The convergence, neither sought nor provoked, of the results of work conducted independently of one another, constitutes in itself a significant argument in favour of this theory." — John Paul II, Message to the Pontifical Academy of Sciences, 22 October 1996, § 4^[76]

But John Paul II maintains the ontological discontinuity:

"If the human body takes its origin from pre-existing living matter, the spiritual soul is immediately created by God." — John Paul II, Message to the Pontifical Academy of Sciences, 22 October 1996, § 5^[77]

And the same paragraph explicitly sets aside materialist readings:

"Consequently, theories of evolution which, according to the philosophies that inspire them, consider the spirit as emerging from the forces of living matter or as a mere epiphenomenon of that matter are incompatible with the truth about man." — John Paul II, Message to the Pontifical Academy of Sciences, 22 October 1996, § 5^[78]

And he names what Darwin cannot explain by natural selection:

"With man, we thus find ourselves before an ontological difference, before an ontological leap, one could say." — John Paul II, Message to the Pontifical Academy of Sciences, 22 October 1996, § 6^[79]

Fides et Ratio: the two wings (John Paul II, 1998)

The encyclical Fides et Ratio opens with a formula that has become the symbol of the Catholic position on faith and reason:

"Faith and reason are like the two wings which enable the human mind to rise to the contemplation of truth." — John Paul II, Encyclical Fides et Ratio, 14 September 1998, Prologue^[80]

The image of the "two wings" says several things at once: both are necessary to fly (one wing alone is not enough); they differ in their nature; they tend towards the same horizon — the Truth. Human reason is not the adversary of faith. Faith is not the substitute for reason.

The encyclical explicitly criticises scientism (§ 88): that philosophy which "refuses to admit as valid forms of knowledge other than those proper to the positive sciences, relegating religious and theological knowledge, as well as ethical and aesthetic knowledge, to the realm of pure imagination"^[81].

Benedict XVI at Regensburg: broadening reason (2006)

The Regensburg address (12 September 2006) contains a formula often quoted out of context, but whose central thesis matters for the faith-science relationship:

"Not to act in accordance with reason is contrary to the nature of God." — Benedict XVI, Regensburg Address, 12 September 2006^[82]

Benedict XVI criticises what he calls "the self-limitation of reason to what can be falsified in experience"^[83]. Modern reason, by limiting itself to the empirically verifiable alone, has amputated a space that legitimately belongs to it: philosophy, ethics, the question of being. This is not a call to restrict science; it is a call not to reduce reason to the scientific method alone.

What scientism is (and is not)

A careful distinction is needed:

• Science: the set of empirical and rational methods producing knowledge about the measurable phenomena of the natural world — an admirable human enterprise, which the Church does not attack.
• Scientism: the philosophical thesis that only the experimental sciences give true knowledge of reality, and that every other discourse (ethical, metaphysical, theological, aesthetic) is at best metaphor, at worst absurdity.

Scientism is not a conclusion of science — it is a philosophical position on what science can do. And this position cannot be demonstrated by any laboratory experiment. It refutes itself.

The intellectual origins of scientism

Auguste Comte (1798-1857) formulated positivism with his "law of three stages": humanity passes from the theological stage, to the metaphysical stage, then to the positive state — where only science counts^[84]. The Vienna Circle (1920s) radicalised this position with the verification principle: a proposition has meaning only if it is empirically verifiable or analytically true^[85]. Consequence: metaphysical, ethical and theological statements would be "pseudo-propositions" without meaning.

Karl Popper criticised the verification principle and replaced it with the falsification criterion — a proposition is scientific if it can be refuted by experiment^[86]. But Popper himself acknowledged that metaphysics, though not falsifiable, is not without meaning — which distinguishes his position from pure scientism.

Max Weber: Christian rationalisation as the Western matrix

The sociologist Max Weber (1864-1920), an agnostic and founder of modern sociology, contributes on this question a testimony from outside Catholic apologetics. He observes that the Western monk of the Middle Ages already embodied in his time the first man living according to reason, and he concludes that in the West, Christianity bore incomparable fruits in the domain of knowledge — notably through methodical scientific inquiry, which India then lacked, where the natural sciences were nevertheless highly developed^[87]. This reading does not claim that "the Church invented science" through a single causality: it places monastic and scholastic rationalisation among the cultural conditions that made the emergence of a specifically Western experimental science possible — a thesis converging with Peter Harrison's cited above.

The self-refutation of scientism

The most devastating critique of scientism comes from within science. Jacques Monod (1910-1976), 1965 Nobel Prize in Medicine, a convinced atheist, formulates in Chance and Necessity (1970) what is in reality a self-refutation of scientism:

"The cornerstone of the scientific method is the postulate of the objectivity of Nature. That is to say, the systematic refusal to consider as capable of leading to 'true' knowledge any interpretation of phenomena given in terms of final causes — that is to say, of 'purpose'. [...] It is obviously impossible to imagine an experiment that could prove the non-existence of a purpose, of a pursued goal, anywhere in nature." — Jacques Monod, Chance and Necessity, Seuil, Paris, 1970, p. 37^[88]

In other words: the principle of objectivity that founds science is itself scientifically indemonstrable. It is a philosophical decision prior to any experiment. If science rests on a presupposition it cannot validate by its own methods, scientism — which claims that only science can validate assertions — refutes itself.

What science cannot say

Ludwig Wittgenstein (1889-1951) formulates in the Tractatus Logico-Philosophicus (1921) the logical limits of scientific discourse:

"We feel that even when all possible scientific questions have been answered, the problems of life remain completely untouched." — Ludwig Wittgenstein, Tractatus Logico-Philosophicus, § 6.52, translated by Gilles Gaston Granger, Gallimard, Paris, 1993^[89]

And in the same work:

"The sense of the world must lie outside the world. [...] there is no value in it." — Ludwig Wittgenstein, Tractatus Logico-Philosophicus, § 6.41^[90]

Science describes the world — it cannot give it meaning. It can explain how natural selection works; it cannot say whether life has value. It can calculate the energy of an atomic explosion; it cannot decide whether using it is just or unjust.

Stephen Hawking himself, in one of his last interrogations, asks the question physics cannot solve:

"What is it that breathes fire into the equations and makes a universe for them to describe?" — Stephen Hawking, A Brief History of Time, Bantam Books, London, 1988, concluding chapter^[91]

This question — why is there something rather than nothing — is the metaphysical question par excellence. It is asked by an atheist physicist, precisely because he knows it exceeds the framework of physics.

The German philosopher Jürgen Habermas, one of the major figures of contemporary philosophy, warns against the same reductionism applied to the human being: extending the categories of physics, neurophysiology or evolutionary theory to the whole of human experience would produce a purely naturalistic image of man, which would entirely desocialise our understanding of ourselves^[92].

Habermas does not dispute physics, neurophysiology or evolutionary theory as sciences: he disputes the extension of their categories to the whole of human experience — freedom, responsibility, meaning, relationship to others — which structurally eludes a purely causal description.

Science answers the "how" — not the "why"

The classic Catholic position, formulated notably by Thomas Aquinas (1225-1274), distinguishes secondary causes (the natural mechanisms studied by science) from the first cause (God, who gives being to these mechanisms)^[93]. God is not a "gap-filling variable" between two scientific unknowns — he is not the hypothesis invoked for lack of a natural explanation. He is the cause of the very being of the world, including its regularities and natural laws.

That is why science can progress indefinitely in knowledge of natural mechanisms without ever "finding God" or "refuting" him — because God is not one mechanism among others. The natural sciences and theology answer different questions. One studies how the world works; the other asks why there is a world, and why it is intelligible.

The real fault of Galileo

It would be apologetically dishonest to minimise the Galileo case entirely. The ecclesial error is real, and John Paul II did not deny it. Theologians transposed into the domain of doctrine a question of astronomy — a grave methodological error.

Galileo himself was not wrong on the essentials of his scientific intuition, even if his proofs were incomplete in 1633. The fact that an institution nearly two millennia old could publicly acknowledge this error in 1992 — through the voice of the pope before an international assembly of scientists — is itself an act few institutions are capable of.

The Index of Forbidden Books

The Index Librorum Prohibitorum, created in 1559 under Paul IV, led to bans that proved mistaken — not only for Copernicus (1616-1835) and Galileo, but for several other authors whose works were not heretical. The fact that the list often confused legitimate theological criticism with undue doctrinal condemnation represents an imperfect instrument whose abuse caused real intellectual damage. The Index was abolished in 1966 by Paul VI.

Popular representations corrected by science

It would also be dishonest to claim that science never corrected anything in popular religious representations. Manfred Lütz notes a concrete and instructive example:

"New scientific knowledge stimulated human thought and led to remarkable technical achievements, whose effects extended into everyday life. One need only think of the lightning rod, invented in 1750: until then, lightning and thunder were concrete proof of God's anger, of his thundering voice and his punishment." — Manfred Lütz, Le christianisme en procès, Éditions Emmanuel, Paris, 2019, p. 176^[94]

The lightning rod refuted nothing of the content of the Christian faith — neither the Redemption, nor the Resurrection, nor the sacraments. It corrected one particular popular religious interpretation, which was never a dogma defined by the Church: the idea that lightning would be a direct and univocal signal of divine anger. This is precisely the distinction that Gaudium et Spes § 36 would formalise two centuries later: methodical scientific research has its legitimate autonomy, even when it displaces pious popular representations that never engaged the deposit of faith.

The real tensions in history

Other tensions between local ecclesiastical authorities and researchers existed, notably on questions of dissection (in certain regions, at certain periods — but never as a general policy of the Church), or on geological and palaeontological questions in the 19th century. These tensions are real and must not be erased. They do not, however, constitute a systematic institutional policy of opposition to science — they are episodes in a long and complex history, where unfamiliarity with scientific methods sometimes led local ecclesial leaders to imprudent judgements.

The honest distinction is between:

• real and recognisable historical errors, which the Church acknowledges as such;
• a structural hostility to science, which history does not confirm.

The relationship between the Catholic Church and science is neither a perfect alliance nor a permanent conflict. It is a complex history, crossed by real tensions and real fruitfulness, which the 19th-century caricature profoundly distorted.

On the essentials, Catholic doctrine is clear:

1. The world is intelligible because it comes from a rational Creator — this presupposition is one of the cultural drivers that made the birth of modern science in the Christian West possible.
2. Human reason can know reality — this is not obvious in every philosophical tradition.
3. The sciences have a legitimate autonomy — they do not need to quote the Bible to study a cell or calculate an orbit.
4. Science does not exhaust reason — questions of meaning, value, being and God do not belong to physics, but are not irrational for all that.
5. Scientism is a philosophy, not a science — and a self-refuting philosophy.

The real opposition is not between Catholicism and science. It lies between two symmetrical reductions: a religion that would make the Bible a physics manual, and a scientism that would make the experimental method a total metaphysics. Serious Catholicism refuses both.

• Cosmological fine-tuning — when physics meets the philosophy of nature.
• The argument from contingency — why the question of being exceeds physics.
• The theory of evolution: limits — distinguishing science, interpretation and materialism.
• Did Adam and Eve exist? — Bible, science and historical realism.
• The limits of carbon-14 — an example of a scientific method and its conditions of validity.
• Pascal's wager — can reason open onto faith?
• The bloody legend of the Spanish Inquisition — the complete archives of the most caricatured tribunal in history.