What two events made it possible for christianity to grow rapidly

The two events that made it possible for christianity to grow rapidly are:
1. Theodosius I made it the official religion of the Roman Empire
 
2. The Roman Empire split >>>>It was Theodosius who made Christianity the official and legal religion of the Roman Empire. Though Constantine made Christianity the legal religion of the Romans, it was Theodosius who cut off paganism rites and made Christianity an official religion on the Roman Empire.

two events that made it possible for Christianity to grow rapidly were: 1. Theodosius I made it the official religion of the Roman Empire, which means there was an additional amount of increse from a whole nation. 2. The Roman Empire split. After The roman empire was split, the constantly tried to conquer the regions around them to make them stronger than the other, which also widen the spread of Christianity