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In 140ad, the Turkish merchant and ship owner Marcion of Sinope began proclaiming throughout the regions of Rome and Turkey that the God of the Old Testament (OT) was incompatible – no, completely contrary – to the God proclaimed by Jesus of Nazareth in the New Testament (NT). Marcion rejected the entirety of the Old Testament and even redacted the New Testament in such a way that every Old Testament reference was edited out. Ironically, Marcion also only accepted the gospel of Luke as legitimate (because of the overwhelming amount of Old Testament usage in the other gospels). Marcion was widely regarded as a heretic with all of his teachings being biblically refuted by scholars such as Tertullian and Justin Martyr (among many others). But why? Why was Marcion regarded as a heretic? Why did Marcion reject the God of the Old Testament in the first place?