Here’s an interesting study: Children exposed to religion have trouble telling fact from fiction.
…children who went to church or were enrolled in a parochial school were significantly less able than secular children to identify supernatural elements, such as talking animals, as fictional.
In other words, they are gullible. That’s not what we want for our children before we send them out into a sometimes cruel world. Unless they can evaluate who is likely telling the truth and who is telling a comfortable lie, they are in for some rude shocks.