What is hard to figure out is how people know that they have gotten the right interpretation, right version of Christianity, right church, etc. They were either raised in it or they liked the people who introduced it to them, or they found something about it that "feels right" to them. None of those things has any truth value.
Many people have been tricked into relationships and even marriage by people who claimed to love them. But they just wanted sex or money. Many people have been robbed, conned, swindled by someone who gave off a "good feeling". That's what con artists (like my late father) are experts at.
Why is it that people don't recognize the same thing when it comes to religion? Could it be that people realize that there is really no accurate way to tell, so they just hope that picking any religion--like the one they grew up in, or the one with nice services-- is better than none? Kind of a blind Pascal's Wager? Or do most people not really even think about this?