What changes in early Christian doctrine might have had a pivotal role in its acceptance as a world religion?

Question by Chris C: What changes in early Christian doctrine might have had a pivotal role in its acceptance as a world religion?
I am interested in doctrines introduced by St Paul and some of the early church fathers which from a theological point of view might have gone either way but from a practical point of view might have blocked the growth of Christianity into a major world religion. One I could think of for instance was removing the requirement for converts to be circumcised – a necessity for Jews but whether it was necessary for converts was argued both ways in the early church. Can you think of any others?

Best answer:

Answer by Frank B
It was the acceptance of the Roman Empire that ensured the worldwide acceptance.

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