Question

Why did Christianity spread so rapidly throughout the Roman Empire and eventually become the official Roman state religion?

Answer 1

Constantine made the official religion of the Roman empire.

Step-by-step explanation:

Before Constantine, Roman emperors didn't like Christianity as they feared, will be used to revolt against them. But when Constantine in battle saw a symbol in the sky or god and won. Constantine began accepting Christianity in Rome and later became the Roman Empire's official religion.