Some religions like Islam prevent you from doubting it, so it’s essentially a way in which many are just stuck in it.
But yea when you see political elections, takes on certain subjects etc… don’t expect people to take the time to find the info.
There might be some errors and mistakes that point towards religions being fake and man-made, but there aren’t really any obviously accepted error. Most of the time, they’ll end up with "it meant something else" or something like that.
They are subjects to some bias, yes, but that doesn’t mean they’re braindead, else you would consider vast majority of people on earth to be braindead.
You can at least understand that some people believe that the universe was created by some sort of entity, as the odds of all of this being created, with such a perfect balance, and having a creature with a developed conscience (humans) is extremely rare and lucky.