Christianity was no longer persecuted by the Empire in the 300s, and became the official state religion of the empire (to the exclusion of all others) in 380 under Emperor Theodosius I. To this day, the Nicene Creed, created at the behest of the Roman Emperor Constantine I in 325 at the first ecumenical council, is the most common creed in all of Christianity.
No, it can’t be debated. You need to go brush up on your history.
When I speak of Christianity I’m speaking of true belief in the Lord Jesus. Anyone can say they are Christian or Holy. Those terms are applied loosely and were even then. Just because it was the ‘designated’ religion of Rome or that the Christians were no longer persecuted does not mean it was a ‘holy’ place.
And I do not FAIL in my history dear self professed experts. I did not dispute what you are saying...And yes it can be debated. Similar to whether or not the marxist in the WH, who professes to be a Christian, is or not. Just because it is ‘professed’ does not make it so.