This point gets misunderstood because people start looking for a specific date that this occurred, but it was throughout the 300's that the RCC emerged as the dominant state church. Prior to Constantine the church in Rome was one among many. Christians were unified by a common faith. After Constantine you see force used on Christians by the Roman Church to enforce their will.
Also, through the course of the 300's you see the church in Rome go from being persecuted, to approved by the state and then the state religion. In the process the persecuted became the persecutors. Also, you see paganism "Christianized" and made acceptable in this church. This church became worldly and in the process you see worship of the Queen of Heaven become worship of Mary. Praying to saints became acceptable instead of praying to other gods. Babylonians would bow and kiss their idols and now this is done to statues of saints. The faithful began to be required to return to the priesthood for forgiveness and grace. These things were not acceptable in the pre-300's.
EXCELLENT UNRUBBERIZED HISTORICAL POINTS.
THX.