I once got in trouble because I asked my mom how she knows Christianity is the correct religion, as I had been getting fascinated by dead religions.
The conversation was roughly
MoM: because the Bible is inspired by god, and it's infallible.
Says who?
M: the people who wrote it.
The dozens of middle eastern men over hundreds of years? Most of whom never had contact with each other, and then many hundreds of years later a bunch of old white European dudes decided to put them in a specific order, and throw out a bunch of things they decided weren't needed?
M: they were all guided by God.
So the entire belief in this is backed up by the fact that it says it's telling the truth and we're just supposed to take it at its word? What if another book was written that said IT'S the only real one and that you have to murder 5 people every day or you go to hell? How do you know which one is actually true and which one you just happened to grow up with?
At this point I was grounded. And told I should read the Bible while grounded. Of course by then I had already read it cover to cover, and wondered why the church I went to was giving these things to children given some passages are pretty graphic or explicit.
I've lived in them almost exclusively.