After they created confessions (meaning somehow the priest can 'cleanse' you of your sins, God won't take you touching your niece into consideration for your judgment because you told some old dude about it and you recited 5 prayers to virgin Mary, lol) and purgatory (it used to be a binary destination, either Heaven and Hell, but the Church needed money lenders and usury to get coin for wars and whatnot and made it up to legitimise what had been seen as inmoral for ages) Christian dogma was fully cooked.

The problem starts with Paul (well, actually, with Rome and the creation of a new religion, and then the Council of Nicea. People in the West would've been some kind of Jewish if not, like Jesus was) and his idea of "faith without works" and "belief that God exists and Jesus submitted to Him is enough to be saved!", which was vehemently opposed by Jesus' actual followers that understood that faith without works is dead at best, hypocritical if not, and that even "demons believe in God, and they shudder" (sure, God exists and is always watching, but do you act like it?!). But Rome preferred/established this as canon and you can see the repercussions everywhere today, particularly in the Godless, amoral West. How could they act right, when their ideological base is so flimsy and tolerant of sin?