From time to time we hear (or read) the expression “Constantinian Christianity”. It seems to be a fairly recent term, though I don’t know exactly who originated it, and when. I found three names, Stanley Hauerwas, John Howard Yoder, and Cornel West, but whether it dates back earlier than any of these three, I don’t know. It seems to be used, invariably, in a derogatory sense, implying that “Constantinian Christianity” is an inferior, second-rate kind of religion. We don’t see people describing themselves as “Constantinian Christians,” only other people, that the writer or speaker disapproves of.
Another term, the “Constantinian shift,” seems to be more neutral in tone, expressing neither approval nor disapproval, but just labeling an event that happened in the history of Christianity. I have seen it defined as “First and foremost, what happens to the church when worldly power is used to accomplish what God has given his people to do without such power.”
The three writers I named are certainly not Catholics, but the argument they are advancing seems to have some substance to it. It’s not just an obvious production-line fabrication of the common anti-Catholic, Chick Tract kind.
Maybe if @billsherman sees this he can help?