Marcionism

The Story

Around 140 AD, a wealthy shipbuilder’s son from Sinope (modern-day Turkey) named Marcion arrived in Rome with a massive donation to the church and a theology that would shake early Christianity to its foundations. His central claim was deceptively simple: the God who created the world and gave the Law to Israel was not the same God that Jesus called Father.

Marcion was not some fringe crank. He was a bishop’s son, deeply literate, and utterly sincere. He had read the Hebrew scriptures carefully and found a God who ordered genocides, hardened hearts, created evil (Isaiah 45:7), and regretted making humanity. Then he read Paul’s letters and the Gospel of Luke, and found a God of pure mercy, grace, and love. His conclusion? These could not possibly be the same being.

He proposed that the God of the Old Testament — whom he called the Demiurge — was a just but harsh creator deity, while the Father of Jesus was a previously unknown God of pure goodness who sent Christ to rescue humanity from the Demiurge’s flawed creation. Jesus, in Marcion’s reading, did not come to fulfill the Law but to abolish it entirely.

Marcion produced the first known attempt at a Christian canon: an edited version of Luke’s Gospel (stripped of its Jewish elements) and ten of Paul’s letters (similarly pruned). He rejected the entire Old Testament and any New Testament writing he considered too Jewish. In doing so, he arguably forced the broader church to start thinking seriously about which texts were authoritative — a process that would take centuries to complete.

The church in Rome excommunicated Marcion in 144 AD and returned his donation. But his movement did not die easily. Marcionite churches spread across the Mediterranean and persisted for centuries. Tertullian wrote five books against him. Justin Martyr warned about him. Irenaeus built much of his theology in response to him. Marcion was, in many ways, the most important heretic of the second century.

What the Council Actually Said

Marcion’s condemnation came not from an ecumenical council but from the Roman church’s direct action:

Marcion was expelled from the fellowship of the church in Rome and his monetary gift returned to him, on the grounds that he taught two Gods and rejected the writings of the prophets and the Law.

Tertullian, writing around 207 AD, summarized the charge:

“The separation of the Law and the Gospel is the primary and principal work of Marcion.”

Why You Might Accidentally Believe This

If you have ever felt uncomfortable reading certain Old Testament passages — the conquest narratives, the commands regarding slavery, the seemingly capricious punishments — you have felt the pull that Marcion felt. Many modern Christians functionally ignore the Old Testament, treating it as a kind of backstory that Jesus superseded. Churches that never preach from the Hebrew scriptures, that treat the “God of the Old Testament” as fundamentally different in character from the “God of the New Testament,” are walking in Marcion’s footsteps without knowing it.

The popular framing of “the Old Testament God is wrathful, the New Testament God is loving” is essentially Marcionism in casual dress. Every time someone says “but that was the old covenant” to dismiss an uncomfortable text rather than wrestling with it, Marcion smiles from the grave.

The Strongest Case For This View

Marcion had genuine textual tensions to work with. The God who commands the slaughter of the Amalekites (1 Samuel 15) and the God whom Jesus describes as making the sun rise on the evil and the good (Matthew 5:45) are not easy to reconcile without serious theological work. Paul’s own contrasts between Law and Gospel, flesh and spirit, bondage and freedom provided Marcion with ready-made categories. If you read Galatians with fresh eyes, you can see why Marcion claimed Paul as his champion.

There is also a moral argument. If the conquest narratives describe real divine commands, and if those commands represent the same moral character as Jesus washing his disciples’ feet, then explaining that continuity requires sophisticated hermeneutics that were not fully developed in the second century — and remain contested today.

The Strongest Case Against

The New Testament itself resists the Marcionite split at almost every turn. Jesus quotes the Old Testament as authoritative. He says he came not to abolish the Law but to fulfill it (Matthew 5:17). Paul, Marcion’s supposed hero, calls the Law “holy and righteous and good” (Romans 7:12) and argues that the scriptures of Israel testify to Christ (Romans 1:2). Luke’s Gospel — the very text Marcion chose as his sole Gospel — is saturated with Old Testament allusions and explicitly presents Jesus as the fulfillment of Israel’s hopes.

The theological argument is equally strong. If the creator God is not the redeemer God, then creation itself is suspect — which leads directly toward the kind of body-denying, world-rejecting spirituality that the early church consistently rejected. The goodness of creation and the goodness of redemption stand or fall together.

What the New Testament Actually Says

Paul’s letter to the Romans is perhaps the strongest anti-Marcionite text in the canon, despite Marcion’s attempt to claim Paul. Romans 9-11 insists that God has not rejected Israel, that the gifts and calling of God are irrevocable (Romans 11:29), and that the story of salvation runs through — not around — the history of Israel.

Jesus himself, in Luke 24:27, interprets “all the scriptures” (meaning the Hebrew Bible) as speaking about himself. The author of Hebrews argues that the same God who spoke through the prophets has now spoken through a Son (Hebrews 1:1-2) — not a different God, but the same one, speaking with greater clarity.

2 Timothy 3:16 affirms that “all scripture” — which for the original audience meant the Old Testament — is God-breathed and profitable. The early church read these texts as affirming a single divine author behind both testaments, even when the tensions between them required patient interpretation.

Further Reading

• Tertullian, Against Marcion (c. 207 AD)
• Adolf von Harnack, Marcion: The Gospel of the Alien God (1924)
• Jason BeDuhn, The First New Testament: Marcion’s Scriptural Canon (2013)
• Judith Lieu, Marcion and the Making of a Heretic (2015)