Do we have any good historical data and theoretical conceptions for why and how Christianity appealed so much to and spread so vastly within the Greco-Roman world in the first few centuries ACE?

Doesn’t Genesis 6:19 imply a significant diminution in the power of God who, a few chapters before, had CREATED all living things? Why round up all the animals? Couldn’t God have just created them anew after the flood?

We know that Zoroastrianism had a profound impact on second temple theology, but could the reverse have also occurred. Could the angel mythology and sacred fires of the first temple cult have influenced Zoroastrianism?

Do you know people who actually have memorized the Bible, all of it, and could demonstrate it?