What reasons helped Christianity spread among Roman citizens?

In the 1-3 centuries, Christianity began to spread rapidly throughout the Roman Empire. This was due to the fact that this religion protected the weak and the poor, and then there were a lot of slaves in the empire. Thus, the new religion spread with amazing speed throughout the empire. She soon became dominant. So already in the 4th century, this religion was able to become a state religion. This was done by the emperor Constantine, who by that time was a pagan.

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