Hmm. You seem to know many things about religions, but let me express my opinion about Christianity.
Christians were nοt always that good as they look like. A lot of Christians were murderers and rapists so they had been slaves from their own mistakes.
Yes, I know that Romans were not that good too, but they were more educated and didn't do that shit. Christians in that period of the time were monkeys !!!
Romans (and Ancient Greeks) not believed in Gods, they just worshiped them as elements of nature! Thats the reason that they never had a problem with their religion!
If you have something to tell me let me know
Sorry for any mistake in English :P