>>17377210You should study the Roman empire and a bit about other kingdoms and nations of the time.
One important thing to understand is that crucifixion was a popular punishment in Carthage and Persia and Babylon and other countries for centuries, not just in Rome.
Another thing to understand is the position of subjugated people within Roman empire. The position of any non Roman citizens and even of some plebs that had citizenship.
When you understand it all you will understand why Christianity spread so fast.
But only when you understand all of that can you understand why an emperor also became a Christian. And why he made it the official religion of the empire.