Major change in religion during the late Roman world?

Can someone please list the major change in the role, shape of religion during the late Roman world. Please include the why and how it changes from Imperial Cult to later Christianity in an attempt to rebuild unity and identity. How did St. Augustines Confession identify with these ideas?Major change in religion during the late Roman world?
Constantine had a huge effect on Christianizing what was a dwindling Roman Empire after he became a Christian.

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