Maybe we could start with a Catholic site?
“On October 28, 312, Emperor Constantine met Emperor Maxentius in battle just outside the city of Rome at the Milvian Bridge, spanning the Tiber. This battle—occurring exactly 1,700 years ago—is one of the most important events in the history of Christendom, since it was through Constantine’s victory that Christendom began. It is a battle well worth reflecting upon. (http://www.catholicworldreport.com/Item/1697/constantines_gift_to_christianity.aspx)
Then we have this from Catholic Online.
St. Constantine the Great.
Constantine was the most dominating figure of his lifetime, towering over his contemporaries, including Pope Sylvester I. He presided over the Council of Nicaea, gave extensive grants of land and property to the Church, founded the Christian city of Constantinople to serve as his new capital, and undertook a long-sighted program of Christianization for the whole of the Roman Empire. (http://www.catholic.org/saints/saint.php?saint_id=2731)
Then we only have to look at the pagan practices of the Roman Empire prior to Constantine to understand the struggle to “Christianize” the pagan practices to appease the people.
Isis became Mary. Mithraism with it’s flesh and blood of the bull. The henotheists with their many gods became many Saints who are in charge of areas of life such as war, peace etc. Then there are the patron saints just like the pagans had over cities or areas. Of course that Papacy was a natural since Constantine wanted all power in Rome.
Anyone with eyes wide open can see what happened.
Maybe you should start with some relevant postings. What you posted in no way affirms any contention that Constantine established the Catholic Church. The first citation lead to the Edict of Milan in 313 AD that lead to the legalization of Christianity as well as every other religion in the Roman Empire. Your second citation mentions the Pope Sylvester, the 33rd Pope. Your last uncited paragraphs are just the the sort of anti-Catholic nonsense I expected.
God night