A significant reason that Christianity is false, also a significant reason it is popular and enduring, is that it lets you spiritually bypass the process of dialectic.
It claims the answers matter more than the questions. This is false, and it falsely elevates rote pablum into an idol far more spiritually noxious than even the most lurid animist fetish-totem.
The process of dialectic is sacred. Every incomplete answer builds up the eye of the soul and propels it towards the truth. When you subject man to an imposed authority which, if it doesn't punish dialectic, at the least strongly claims that it is irrelevant and unnecessary to the health of the soul, THAT is when you get the confusion and the "backslide down the other side of the mountain" you describe.
You get super powers when you read the ancient pagans debating things endlessly and they all have extremely great points really but then you realize Jesus calls a ball or a strike and you can say oh thank God that is settled. Praise be to God. Reading pagans is extremely useful for evangelism and pulling people out of the waters. And in the upcoming confusion many will fall back precisely into the pagan ways of the before times just like someone might reach the top of a mountain and come back down on the other side, so by reading the pagans you can see the future of the United States of America.