Is the God of the Old Testament Different from the God of the New Testament?

The Popular Form

Today, the objection circulates in a simple, almost proverbial form: the God of the Old Testament “punishes, exterminates, and becomes angry,” while the God of Jesus “forgives, heals, and loves.” The Flood is opposed to the parable of the prodigal son, the fire of Sodom to the Beatitudes, the command to exterminate the Canaanites to “Love your enemies.” The conclusion seems obvious: it cannot be the same God.

This objection feeds on a selective reading. It accumulates on one side the harshest passages of the Old Testament, and on the other the gentlest words of the New, then presents this manipulated contrast as if it faithfully summarized both corpora. It also wrongly assumes that the Old Testament ignores tenderness and that the New Testament ignores judgment. We will see that both assumptions are false.

The Strong Version: Marcion and His Antitheses

The scholarly version of the objection does not stop at a feeling; it presents itself as a demonstration. Its inventor, Marcion, composed an entire book, the Antitheses, where he methodically lined up the apparent contradictions between the God of the Old Testament and the Father of Jesus: the God who commands “eye for an eye” against the one who says “turn the other cheek”; the God who curses against the one who blesses; the God who strikes against the one who heals^[1]. He is the direct ancestor of all the lists of “biblical horrors” found today.

The strength of Marcion’s version is that he takes the objection seriously to the end. If these two portraits are truly irreconcilable, then there must be two distinct subjects. Marcion does not hesitate: he posits two gods. This is consistent—but it is precisely what the Church judged impossible to reconcile with the faith received from the apostles.

The Contemporary Revival: Dawkins and the New Atheists

Biologist Richard Dawkins gave the objection its most famous modern formulation in The God Delusion (2006). The portrait has become a classic of anti-religious polemic:

“The God of the Old Testament is arguably the most unpleasant character in all fiction: jealous and proud of it; petty, unjust, spiteful; a control freak; vindictive, bloodthirsty, ethnic cleanser; misogynist, homophobe, racist, infanticidal, genocidal, filicidal, pestilential, megalomaniacal, sadomasochistic, brutal, and capriciously malevolent.” — Richard Dawkins, The God Delusion, 2006^[2]

The difference with Marcion is instructive. Marcion believed in the God of Jesus; he only wanted to separate Him from the God of the Old Testament. Dawkins, on the other hand, uses the same contrast to reject all gods. But the rhetorical mechanism is identical: isolate the harshest passages, detach them from their context and intention, then paint a damning portrait. The Catholic response to one thus sheds light on the response to the other.

What the Objection Gets Right

Honest apologetics does not caricature the opponent: it first recognizes what is true in the objection. And there is something true. The Old Testament really contains perplexing passages: orders of extermination, collective punishments, a violence that the modern reader receives as scandalous. The Church does not deny this. Benedict XVI speaks frankly of the “dark pages” of the Bible^[3]. The tone, the image of God, the moral quality of the behaviors reported visibly change between Genesis and the Gospel. The error of the objection is therefore not in noticing a difference: it is in concluding a contradiction of subjects. Between the teacher speaking to a six-year-old child and the professor addressing an adult, the tone, vocabulary, and demands differ radically—without it being a matter of two opposing persons. The real question is not “Has the tone changed?” (yes), but “Is it the same God?”. The entire following discussion answers this second question.

The objection is best understood by looking at its first theorist. For Marcionism is not a curiosity of scholars: it is the moment when the objection was pushed to its logical consequences, and when the Church had to clearly state what it believed.

Who was Marcion of Sinope?

Marcion was born around 85 in Sinope, a port on the Black Sea in Pontus. According to tradition, he was the son of a bishop and a wealthy shipowner. He arrived in Rome around 140 and initially made a considerable donation to the Christian community. But his teachings caused concern. Around 144, the Church of Rome broke with him and returned his money^[4]. Marcion then founded his own Church, with its own clergy, sacraments, and canon—a counter-Church that, for a century, dangerously rivaled the great Church throughout the Empire.

This detail matters: Marcionism was not a marginal movement easily dismissed. It forced the Church to clarify its faith, to explicitly defend the Old Testament, and to more clearly fix the list of its books. The refutation of Marcion was one of the great theological undertakings of the 2nd century.

The system: the Demiurge versus the Father

The core of Marcion’s doctrine rests on an opposition. There are two gods. The first, the Demiurge, is the creator of the material world; he is the one who speaks in the Old Testament. Marcion does not say he is evil in the sense of a demon: he says he is just, but with a rigid, jealous justice, attached to the Law, punishment, and vengeance. The second, the Father—the “good and unknown God”—has nothing to do with creation; he is pure love, and he sent Jesus to redeem men from the creator God and his Law^[5].

Tertullian summarizes Marcion’s project with a famous formula:

“The separation of the Law and the Gospel is the proper and principal work of Marcion.”
— Tertullian, Against Marcion, Book I^[6]

The entire system flows from this division. Separating the Law from the Gospel, the Old Testament from the New, the creator from the redeemer: this is the founding gesture. And it is exactly the gesture reproduced, in another form, by anyone today who opposes “the God of the Old Testament” to “the God of Jesus.”

Marcion’s mutilated canon

To support such a radical thesis, Marcion had to distort the texts. He therefore rejected the entirety of the Old Testament, judged to be the work of the Demiurge. And, in the New Testament, he kept only one gospel—a revised version of Luke, purged of everything that connected Jesus to the God of Israel—and ten letters of Saint Paul, also corrected^[7]. Everything else—Matthew, Mark, John, Acts, the pastoral epistles, Revelation—was excluded. This point is decisive. To make the two gods plausible, Marcion had to amputate the Bible of three-quarters of its volume, then censor what remained. This is the inadvertent admission of the weakness of the objection: it only holds at the cost of a selective reading elevated to the rank of method. The modern objection proceeds in the same way, on a smaller scale, whenever it cites a terrible verse from the Old Testament while ignoring the oceans of tenderness that surround it.

Paradoxically, by publishing the first closed list of “Christian” books, Marcion forced the Church to make explicit its own. The anti-Marcionite reaction accelerated the recognition of the canon of the four Gospels and the authentic Pauline letters — and the reaffirmation that the Old Testament fully belongs to Christian Scripture^[8].

The Church’s Condemnation and the Fathers’ Refutation

The Church reacted in two ways: through a disciplinary break (the excommunication of 144) and through immense doctrinal work. The greatest theologians of the 2nd and early 3rd centuries devoted entire works to refuting Marcion.

Saint Irenaeus of Lyon, around 180, sets forth the principle that will remain that of the entire tradition: the unity of the author of both Testaments.

“One and the same master of the house produced the two Testaments: the Word of God, our Lord Jesus Christ, who spoke with Abraham as with Moses.”
— Saint Irenaeus of Lyon, Against Heresies, Book IV^[9]

The formula is luminous: it is not merely the “same God” in a vague sense, but the Word himself — the one who will become incarnate in Jesus — who was already speaking to Abraham and Moses. Christ is not the adversary of the God of the Old Testament: he is its eternal voice. Tertullian, Origen, and later Saint Augustine, facing the Manichaeans — bearers of another dualism — would develop the same conviction. Thus, the objection received, from the very beginning, a reasoned and magisterial response.

The Principle: One Economy, Two Testaments

The Catholic faith firmly holds to the unity of the two Testaments, because it holds to the unity of God and the unity of His plan of salvation. The Catechism states this without ambiguity: the Old Testament “is an indispensable part of Sacred Scripture”, its books are “divinely inspired and retain a permanent value”, and the unity of the two Testaments flows from the unity of God’s design^[10].

The Second Vatican Council expressed the same doctrine in Dei Verbum. God is presented there as the sole author of the books of both Testaments, who “wisely arranged” that the New Testament be hidden in the Old and the Old revealed in the New^[11]. There are not two competing revelations, but one single economy—one unfolding of the divine plan in history, from creation to the Covenant, from the Covenant to the prophets, from the prophets to Christ.

“The New is Hidden in the Old”

The key to unity is summed up in a phrase by Saint Augustine, which has become the classic adage of the entire Christian tradition:

“The New Testament is hidden in the Old, and the Old is revealed in the New.”
— Saint Augustine, Questions on the Heptateuch^[12]

Far from being two opposing blocks, the two Testaments are two stages of the same movement. This is what tradition calls typology: the persons, events, and institutions of the Old Testament are figures that announce and prepare what will be fulfilled in Christ^[13]. Adam prefigures Christ, the new Adam; the paschal lamb announces the Lamb of God; the crossing of the Red Sea prefigures baptism; the manna, the Bread of Life; the bronze serpent raised by Moses, the Cross raised on Golgotha. Christ Himself authorizes this reading when He declares: “It was necessary that everything written about me in the Law of Moses, the Prophets, and the Psalms be fulfilled” (Lk 24:44).

This reading is not a mere apologetic trick: it is inscribed in the New Testament itself. Saint Paul writes that the events of the Exodus “happened to them as examples and were written down as warnings for us” (1 Cor 10:11)^[14]. For further study on these levels of interpretation, see the spiritual sense of Scripture.

Jesus and the Apostles Never Had Another God

The simplest and most overwhelming point against the objection is this: Jesus never opposed His Father to the God of Israel. On the contrary, He identifies Him. When asked what is the greatest commandment, He quotes Israel’s Shema, the quintessential Jewish prayer: “Hear, O Israel: The Lord our God, the Lord is one” (Mk 12:29, quoting Dt 6:4)^[15]. The God Jesus calls “Abba, Father” is the God of Abraham, Isaac, and Jacob.

Moreover, Jesus strongly affirms the continuity of Scripture, not its rupture:

“Do not think that I have come to abolish the Law or the Prophets; I have not come to abolish them but to fulfill them.”
— Jesus, Gospel according to Saint Matthew 5:17^[16]

If there had been two gods, Jesus would have known better than anyone. Yet He prays the Psalms, quotes the Law, refers to Moses, Isaiah, Jonah, and David as the Word of His Father. On the cross, He prays by quoting Psalm 22 (“My God, my God, why have you forsaken me?”, Mt 27:46; Mk 15:34). The risen One, on the road to Emmaus, “beginning with Moses and all the Prophets, explained to them what was said in all the Scriptures concerning Himself” (Lk 24:27)^[17]. The entire apostolic preaching consists precisely in showing that Jesus fulfills the Jewish Scriptures—which would be absurd if the God of those Scriptures were His enemy. For the Jewish question itself, see Judaism.

The Testimony of the Church Fathers Against Dualism

The Church Fathers did not merely affirm the unity of God: they demonstrated it against a contemporary and virulent objection. Tertullian devotes five entire books to Against Marcion. His central argument is unyielding logic: a god who is purely “good” but who would never judge, never punish, never enact justice, would not truly be good — he would be indifferent. True goodness includes justice; a love that does not respond to evil would be complacency, not love.

Irenaeus, for his part, shows that the Creator God and the Redeemer God cannot be two, because redemption presupposes creation: one only saves what one has made, and Christ redeems precisely the world and humanity fashioned “in the beginning.” To separate the creator from the savior is to render salvation unintelligible. The unity of God is therefore not an arbitrary dogma: it is the very condition for the Gospel to mean anything.

The hidden spring of the objection is ignorance of the Old Testament. Those who truly read it discover not a god who is only vengeful, but the most tender God there is — so much so that the New Testament only takes up and brings to fullness a love already proclaimed a thousand times.

The God “Slow to Anger and Abounding in Love”

At the heart of the Old Testament, at the very moment when God renews the Covenant with a people who have just betrayed Him with the golden calf, He reveals Himself not by His anger but by His tenderness. This is His identity card, the phrase most cited by the Old Testament itself:

“The Lord, the Lord, a God merciful and gracious, slow to anger, and abounding in steadfast love and faithfulness.”
— The Lord to Moses, Book of Exodus, 34:6^[18]

This phrase is not an exception: it recurs like a refrain throughout the Old Testament. It appears almost word for word in the Psalms, in Joel, in Nehemiah, and in Jonah. Far from being “hot-tempered,” the God of Israel defines Himself as slow to anger. Anger is not His essence; mercy is.

“I Take No Pleasure in the Death of the Wicked”

The objection imagines a God who delights in punishment. The Old Testament says exactly the opposite, twice over, through the prophet Ezekiel:

“Do I take any pleasure in the death of the wicked? — declares the Sovereign Lord. Rather, am I not pleased when they turn from their ways and live?”
— The Lord through the prophet Ezekiel, 18:23^[19]

The same God has the prophet say: “I take no pleasure in the death of anyone who dies — declares the Sovereign Lord. Repent and live!” (Ez 33:11). This is not a bloodthirsty god: it is a God who pleads with His people to repent so that He will not have to punish them. Judgment, in the Old Testament, is never an end in itself; it is the last resort of a love scorned that seeks by all means to save.

The Tender Father of Hosea and the God of Jonah

In the prophet Hosea, God compares Himself to a father teaching his child to walk, unable to bear losing him. This passage is one of the pinnacles of the entire Bible:

“My heart recoils within me; my compassion grows warm and tender. I will not execute my fierce anger; I will not again destroy Ephraim, for I am God and not a man, the Holy One in your midst.”
— The Lord through the prophet Hosea, 11:8-9^[20]

God Himself gives the reason for His restraint: “I am God and not a man.” In other words, His holiness is precisely what makes Him more merciful than a man would be, not more vengeful. The book of Jonah pushes this lesson to the point of satire: God forgives the pagan city of Nineveh, and it is the prophet who is angered, reproaching God for being “a God of tenderness and compassion, slow to anger, abounding in love, and relenting from punishment” (Jon 4:2)^[21]. The God of the Old Testament is so merciful that He scandalizes even His own prophets.

The Psalms: an ocean of mercy

The Psalter, Israel’s and Jesus’ prayer book, unceasingly sings of God’s tenderness. Psalm 103 is its summit:

“As a father has compassion on his children, so the Lord has compassion on those who fear him… The Lord is compassionate and gracious, slow to anger, abounding in love.”
— Psalm 103^[22]

The following table gathers some of the many passages where the Old Testament proclaims divine mercy—long before the Gospel.

Anyone who has read these passages can no longer claim that mercy begins with Jesus. It is already the central attribute of God in the Old Testament. On this theme, see dieu-justice-misericorde and amour-infini-dieu-sacre-coeur-divine-misericorde.

The other half of the illusion is to believe that the New Testament contains only gentleness. This is equally false. Judgment, warning, fear of God, and even hell are taught there—and, strikingly for the objection, it is Christ Himself who speaks of them the most.

Jesus speaks of hell more than anyone else

This is one of the paradoxes of the Gospel: in the Gospels, it is Jesus who speaks the clearest words about “Gehenna” (Mt 25:41; Mt 5:22; Mk 9:43-48) — the “eternal fire,” the “outer darkness” where there will be “weeping and gnashing of teeth.” The parable of the Last Judgment ends with a sentence of a harshness no Old Testament prophet expressed so clearly:

“Depart from me, you who are cursed, into the eternal fire prepared for the devil and his angels.”
— Jesus, Gospel according to Saint Matthew, 25:41^[23]

The gentle Jesus of popular imagery is also the one who, with a whip of cords in hand (Jn 2:15), drives the merchants from the Temple and overturns the tables of the money changers, who calls the Pharisees “whitewashed tombs” and a “brood of vipers” (Mt 23), and who pronounces “woes to you!” with an unprecedented verbal severity. Severity has not changed Testaments: it is borne by the same God, now in person. For details on the doctrine of damnation, see que-dit-leglise-sur-lenfer and enfer-objections-reponses.

Ananias and Sapphira: Apostolic Severity

If one were to look for a narrative in the New Testament as abrupt as the punishments of the Old, one would not have to look long. In the Acts of the Apostles, at the heart of the first Christian community, Ananias and his wife Sapphira lie to the Holy Spirit about the price of a sold field; both fall dead on the spot, one after the other, at the feet of Saint Peter, “and great fear seized the whole church” (Acts 5:1-11)^[24].

This story, which takes place after Pentecost, in the full economy of grace, is enough to shatter the idea of a “softened” New Testament. The Letter to the Hebrews, which is entirely a Christian text, states it plainly: “It is a fearful thing to fall into the hands of the living God” (Heb 10:31), and “our God is a consuming fire” (Heb 12:29)—quoting, moreover, Deuteronomy^[25]. The same God, in both Testaments.

“I have not come to bring peace, but a sword”

The image of an exclusively peaceful Jesus clashes with His own words. He announces that He comes to divide, and uses a warrior image:

“Do not think that I have come to bring peace to the earth; I have not come to bring peace, but a sword.”
— Jesus, Gospel according to Saint Matthew, 10:34^[26]

Properly understood, this statement does not contradict “Love your enemies”: it means that faithfulness to Christ will cause divisions, even within families. But it forbids reducing the Gospel to a religion of sweetness without demands. Likewise, the Book of Revelation—the last book of the New Testament—unfolds images of judgment (Christ who “treads the winepress of the fury of God”, Rev 19:15) at least as terrifying as those of the Old Testament^[27]. The contrast “violent Old Testament / gentle New Testament” does not withstand a complete reading.

The same God, justice and mercy in both Testaments

The following table places side by side some passages to show that each Testament holds together mercy and severity. The dividing line does not run between the two Testaments, but within each one.

The conclusion is clear: if one wanted at all costs “two gods,” one would have to put two in each Testament—which is absurd. The truth is simpler: there is one God, who is both infinitely merciful and perfectly just, in both the Old and the New.

The real difficulty remains, the one the objection rightly targets: the passages where violence is commanded or attributed to God. The Church does not gloss over them; it offers a way to read them that neither betrays the text, nor God, nor moral conscience.

Divine Pedagogy: God Educates a People

The first key is that of progressive revelation. God did not reveal Himself all at once to a perfect people: He took humanity as it was, in an ancient culture marked by violence, and led it step by step toward a higher understanding. This is what Dei Verbum calls divine pedagogy: the books of the Old Testament, “although they contain imperfections and things that are obsolete, nevertheless show a true divine pedagogy”^[28].

The image of the educator is fitting. You don’t teach integral calculus to a six-year-old; you start by counting on fingers. Similarly, God first gave a law that limited vengeance (“an eye for an eye” was, in its context, a brake on escalation, not an encouragement to violence), before revealing, in Jesus, the forgiveness of enemies. The difference in tone between the two Testaments is therefore not a sign of two gods, but of one Teacher who helps His student grow.

The “Dark Pages” According to Benedict XVI

The most recent magisterium confronts the question head-on. In Verbum Domini, under the explicit title “The ‘Dark’ Pages of the Bible”, Benedict XVI writes:

“God’s plan is manifested progressively and is realized slowly, in successive stages, despite human resistance. God chooses a people and educates them with patience.” — Benedict XVI, Verbum Domini, no. 42^[29]

The pope advises neither to hide these pages nor to approve them as they stand, but to situate them: they testify to a stage, a historical and cultural context, within a journey that culminates in Christ. The measure of all Scripture, for the Christian, is Christ—and it is in His light that difficult passages find their meaning and their limit.

The Literal Sense and the Spiritual Sense

The second key is the distinction of the senses of Scripture. The literal sense (what the human author intended to say in his time) does not exhaust the richness of the inspired text. Above it, tradition recognizes a spiritual sense: typological, moral, anagogical. Many war narratives in the Old Testament have, since the Fathers, been reread as the spiritual battle of the soul against sin—not to deny their historical reality, but to draw out the meaning God placed in them with a view to Christ. This reading discipline, explained in detail in the spiritual sense of Scripture, is the exact antidote to the flat literalism shared, curiously, by both fundamentalists and militant atheists: both read the Bible as if it had only one level.

As for the conquest narratives and the herem (the war ban) in the book of Joshua, they raise specific historical and moral questions, addressed separately: see the book of Joshua and, on the criteria for legitimate use of force, what the Church says about just war. This article limits itself to the question of the unity of God, which is not undermined by these difficulties once divine pedagogy is understood.

Old Law and New Law

Classical theology finally illuminates the relationship between the two Testaments by distinguishing between the Old Law and the New Law. Saint Thomas Aquinas teaches that the Old Law was good but imperfect: it prepared for the New Law as a sketch prepares the work, as childhood prepares adulthood^[30]. The New Law does not contradict the old; it fulfills it by internalizing the precept and giving the grace to fulfill it. This is precisely the meaning of Jesus’ “I have not come to abolish, but to fulfill.” Again, continuity and not rupture, perfection and not contradiction.

Neo-Marcionism and the 1937 condemnation

The temptation to separate the two Testaments has never ceased. In the 20th century, it took on a sinister face when certain movements in Germany sought to purge Christianity of its Jewish roots and reject the Old Testament. Pope Pius XI responded in 1937, in the encyclical Mit brennender Sorge, with a solemn defense of the Old Testament:

“The sacred books of the Old Testament are entirely the Word of God and form a substantial part of His Revelation… Whoever wishes to see the biblical history and the wisdom of the doctrines of the Old Testament banished from the Church and from schools blasphemes the Name of God, blasphemes the plan of salvation of the Almighty.”
— Pius XI, encyclical Mit brennender Sorge, March 14, 1937^[31]

The word is strong: blasphemy. To want to tear the Old Testament away from Christianity is not a reform; it is, in the eyes of the Church, an attack on God Himself and His design. Ancient Marcionism and modern “neo-Marcionism” converge in the same gesture—and receive the same condemnation.

What is lost by cutting out the Old Testament

Cutting out the Old Testament does not lighten the faith: it makes it unintelligible. Without the Old Testament, one no longer understands who the Messiah is, why He had to die “according to the Scriptures,” what the Covenant, sacrifice, Passover, priesthood, and Kingdom mean. One loses creation, the fall, and the promise—thus losing the very reasons for the Incarnation and Redemption. The New Testament, deprived of the Old, becomes a text suspended in midair, rootless and without a key. This is why the Church has always held the two together: not out of conservatism, but because the Gospel is the fulfillment of a story.

One face of God, revealed gradually

The fundamental answer can be summed up in a few words. There is not a God of the Old Testament and a God of the New, but one God who reveals Himself progressively, like dawn gradually lighting a landscape before full daylight. At the burning bush, Moses receives the Name; at the Transfiguration, the apostles see the glory—but it is the same light. Severity and tenderness, justice and mercy, are not divided between two deities: they are the two faces of the same love, which wants the good of man enough to take him seriously, and takes man seriously enough to judge him.

The final word belongs to the Letter to the Hebrews, which says in one sentence both continuity and culmination:

*“Long ago, at many times and in many ways, God spoke to our fathers by the prophets; but in these last days he has spoken

• le-sens-spirituel-de-lecriture — how the Church reads the Old Testament in the light of Christ: literal and spiritual sense.
• le-livre-de-josue — the specific question of the conquest narratives and the herem in the Old Testament.
• que-dit-leglise-sur-la-guerre-juste — the criteria for the legitimate use of force.
• mal-et-souffrance — the problem of evil and suffering, distinct from the unity of God.
• dieu-justice-misericorde — how justice and mercy are united in God.
• que-dit-leglise-sur-lenfer · enfer-objections-reponses — the doctrine of judgment and hell.
• le-judaisme — the Church’s relationship to the people of the Old Covenant.
• comment-repondre-a-lobjection-des-contradictions-bibliques — the alleged internal contradictions of the Bible.
• le-probleme-de-latheisme-et-de-la-zetetique — the new atheist critique of religion.