When Rome adopted "christianity" as its religion, Constantine had already overseen the quashing of various sects of christendom, i.e the Donatists, and many others had been dealt with earlier, the persecutions just before Constantine destroyed many of the chrisitian's scriptures.
Hence it was only the politically correct "christians" who took power when backed by Rome, and they pretty soon began to persecute any who did not agree with them !
We do not know what Jesus actually taught, neither do we know for sure the full message of the church just after his death, primitive christianity is lost to us in the main, though we have contributions from early writers, but we don't know of their affinity or accuracy.
What is certain is that the religion that emerged because Rome adopted the christian ideas is an already changed religion from what was practised in the 1st Century, I feel that all traces of the 3rd Century forms that were absorbed would have died the death had not Rome picked it up.
The churches that remained independant of Rome perhaps contain more of primitive christianity ? Difficult to say.
We may not here in England, and therefore subsequently in America, have been allowed to remain Druids though, we may have had to convert to the worship of Mithras had not christianity in its bastardised form become the state religion, the Bishops in Britain would not have had the strength to resist if Mithraism were imposed.
