Marcion of Sinope
Marcion of Sinope, in the early second century, developed an early Christian dualist belief system that understood the god of the Old Testament and creator of the material universe, who he called the Demiurge, as an altogether different being than the God about whom Jesus spoke. Marcion considered Jesus' universal God of compassion and love, who looks upon humanity with benevolence and mercy, incompatible with Old Testament depictions of divinely ordained violence. Accordingly, he did not regard the Hebrew scriptures as part of his scriptural canon. Marcion's teaching was repudiated by Tertullian in five treatises titled "Against Marcion" and Marcion was ultimately excommunicated by the Church.