Final answer:
Early Christians began to separate from Judaism because they accepted Jesus as the Messiah.
Step-by-step explanation:
One reason that early Christians began to separate from Judaism was the acceptance of Jesus as the Messiah. Christianity originated from Judaism, and Jesus was seen as the fulfillment of Jewish prophecies regarding the coming of the Messiah. This belief in Jesus as the Messiah caused a division between those who accepted him and those who did not, leading to the formation of Christianity as a separate religion.