Do you even know anything about history? Emperor Constantine did nothing of the sort you claim
Constantine was the second Roman Emperor to remove the ban on Christianity by the Edict of milan in 313 AD -- his co-Emperor did it one year earlier in the West
And Christianity was not the official religion of the Roman Empire until Augustus Theodosius II in 395 AD
This is just one of the innumerable errors in your post
He had some Christian affections and leanings, and viewed them as a positive force, but most of the evidence shows him as not having a great understanding of theology. The calling of the the Nicene council was to stop the infighting between Christians (imagine the FR religion forum set large with armed bands).
The Orthodox have called him (at times) equal to the Apostles in that they viewed him as the second founder of Rome. However his Arian leanings were well known even back then.