Which event produced a major change in the roman empire's religion? constantine recognized the legality of christianity. muhammad began a campaign of conversion to islam. trade with asia introduced new ideas, such as hinduism. emperor julian renewed the worship of the roman gods.

The answer is A: Constantine recognized the legality of Christianity. This was the biggest change in the Roman Empire to date. Constantine had a change of heart due to a dream he was seen by Jesus- and that is the result he became Christian. In addition, 'the great schism' was a barrier that Constantine and pope were separated (both which they agreed on) due to different ethnicities, languages & culture.

The great schism chart
Constantine's side
East side- middle easterners, Egyptians, turkey
Languages- turkish, Arabica

Pope's side
West side- Rome, Italy
Language- Latin