“In the end what was accomplished in Nicaea and Constantinople was the establishment of a Christianity that was completely separated from Judaism. Since Christianity could not define its borders on the basis of ethnicity, geographical location, or even birth, finding clear ways to separate itself from Judaism was very urgent - and these councils pursued this end vigorously. This had the secondary historical effect of putting the power of the Roman Empire and its church authorities behind the existence of a fully separate “orthodox” Judaism as well. At least from a juridical standpoint, then, Judaism and Christianity became completely separate religions in the fourth century. Before that, no one (except God, of course) had the authority to tell folks that they were or were not Jewish or Christian, and many had chosen to be both. At the time of Jesus, all who followed Jesus - and even those who believed that he was God - were Jews!”