I was wondering how many days of Advent would go by before this inevitable subject would make its annual return.
It's not like the Christians weren't Romans, Greeks, or from any number of regions in Africa or Asia Minor. The religion spread via conversion, mostly among soldiers and slaves/lower classes. Constantine legalized Christianity and integrated it into the Roman Empire as a way to cement his power base. So it wasn't nearly an imposition of values as it was a very natural enculturation of the Classical and Christian world.