Marcion of Sinope

Marcion of Sinope was an early Christian theologian. He taught that the God who sent Jesus Christ was not the same being as the "vengeful" creator god of the world, whom he called the Demiurge.

Marcion saw himself as a follower of the Apostle Paul, whom he considered the only genuine apostle of Jesus. His system of belief became known as Marcionism. He compiled the earliest known list of New Testament books, a move that pushed the proto-orthodox Church to define its own canon in response.

Life

Marcion was born in Pontus (modern-day Turkey), the son of a bishop, likely named Philologus of Sinope, according to Epiphanius. Both Rhodo and Tertullian, who knew him in his later years, described him as a mariner or ship-master. He traveled to Rome sometime between 135 and 140, joined the Roman church, and donated 200,000 sesterces to the congregation.

After conflicts arose, he was excommunicated around 144, and his donation was returned. Irenaeus wrote that a man named Cerdo, from the Simonian school, came to Rome under Pope Hyginus and taught that the God proclaimed by the Law and the Prophets was not the Father of Jesus. According to Irenaeus, Marcion and the Gnostic Valentinus were companions in Rome.

Epiphanius later claimed Marcion was an ascetic who seduced a virgin and was excommunicated by his father, forcing him to leave home. Some scholars see this story as a metaphor for corrupting the Church, noting it contradicts the tradition of Marcion’s strict sexual morality. Tertullian wrote that Marcion repented and agreed to reconcile those he had led astray, but died before doing so; modern scholars doubt this account.

Marcionite Church

The Marcionite church grew rapidly in Marcion’s lifetime, becoming a major rival to other Christian groups. It survived for centuries despite controversy and imperial opposition. Adolf von Harnack later compared Marcion to a second-century "Martin Luther."

Teachings

Studying the Hebrew Bible and early Christian writings, Marcion concluded that many of Jesus’ teachings conflicted with the actions of Yahweh, whom he saw as the belligerent god of the Old Testament. Around 144, he developed a ditheistic system: a higher, transcendent God and a lower creator and ruler, the Demiurge. This resolved what he saw as contradictions between Christian covenant theology and the gospel.

Marcion declared Christianity had no continuity with Judaism and was entirely opposed to Jewish scriptures. He did not claim those scriptures were false, but read them literally, concluding that Yahweh was not the God Jesus spoke of. For instance, he argued that Yahweh walking in Eden and asking where Adam was proved Yahweh had a physical body and lacked universal knowledge—traits incompatible with the Heavenly Father Jesus described.

Marcion called the Old Testament God the Demiurge, a jealous tribal deity of the Jews whose law was legalistic and punitive. In contrast, the God Jesus revealed was a universal God of compassion and love. Marcion wrote a book called Antitheses (now lost) that contrasted the Demiurge with the Heavenly Father. He held Jesus to be the son of the Heavenly Father, but understood the incarnation docetically—Jesus’ body was only an imitation of a material one—and thus denied Jesus’ physical birth, death, and resurrection.

Marcion was the first to codify a Christian canon. It contained eleven books: a shorter version of the Gospel of Luke and ten Pauline epistles (including the Epistle to the Laodiceans, but excluding the Pastoral epistles). Early church writers like Irenaeus, Tertullian, and Epiphanius claimed Marcion edited these texts to fit his theology, a view many modern scholars share. However, some scholars, such as Matthias Klinghardt, have theorized that Marcion’s Gospel was the oldest, though this is contested.