Question

When did Christianity become the official religion for the Roman Empire

Answer 1

Over time, the Christian church and faith grew more organized. In 313 AD, the Emperor Constantine issued the Edict of Milan, which accepted Christianity: 10 years later, it had become the official religion of the Roman Empire.

Answer 2

Nicene Christianity became the state church of the Roman Empire with the Edict of Thessalonica in 323 AD, when Emperor Theodosius I made it the Empire's sole authorized religion.