The theory goes like this: Just a few centuries after Christ's death, around the time the Roman Empire converted to Christianity, the true Faith suffered a catastrophic falling-away, so obscured by worldliness and pagan idolatry, kicking off the Dark Ages of Catholicism, that Christianity required a complete reboot. This theory is popular]] but it's also fiction. This idea of a "Great Apostasy" is one of the cornerstones of American Protestantism,...