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Main articles: Marcion and Marcionism
In 144, the Church in Rome expelled Marcion of Sinope. He thereupon set up his own separate ecclesiastical organization, later called Marcionism. Like the Gnostics, he promoted dualism. Unlike the Gnostics, however, he founded his beliefs not on secret knowledge (gnosis) but on the vast difference between what he saw as the "evil" deity of the Old Testament and the God of love of the New Testament, on which he expounded in his Antithesis. Consequently, Marcionists were vehemently anti-Judaism in their beliefs. They rejected the Jewish-Christian Gospel according to the Hebrews (see also Jewish-Christian Gospels) and all the other Gospels with the single exception of the Gospel of Marcion, which appears to be a redacted version of the Gospel of Luke.
From the perspectives of Tertullian and Epiphanius it appeared that Marcion rejected the non-Lukan gospels; however, in Marcion's time, it may be that the only gospel he was familiar with from Pontus was the gospel of Luke.[citation needed] Although it has been suggested by some that Marcion's gospel pre-dated canonical Luke,[35] the dominant scholarly view is that the Marcionite Gospel was a redaction of canonical Luke in order to conform to Marcion's anti-Jewish stance.[36][37][38]
Marcion argued that Christianity should be solely based on Christian Love. He went so far as to say that Jesus' mission was to overthrow Demiurge—the fickle, cruel, despotic God of the Old Testament—and replace Him with the Supreme God of Love whom Jesus came to reveal. Marcion was labeled a gnostic by Irenaeus. Irenaeus labeled Marcion this because of Marcion expressing this core gnostic belief, that the creator God of the Jews and the Old Testament was the demiurge. This position, he said, was supported by the ten Epistles of Paul that Marcion also accepted. His writing had a profound effect upon the development of Christianity and the canon.[39]