When I was a child I was taught that god could hear every single thought I have, and that he would judge me if I ever thought something inappropriate and sinful. I ate it all up, since I wasn't experienced enough to see through the bullshit. Teaching your child that he has no privacy, even in his own head, is just so utterly fucked up. Same goes for horror stories about life after death, demons, evil spirits, and whatnot; it's child abuse, plain and simple. Most parents who engage in this abuse were themselves brainwashed when they were children; they simply do their part in making sure that this millennia-spanning deception goes on for another generation. It's a self-sufficient system which endlessly propagates these ghastly lies and fantasies.
I can count myself lucky that my indoctrination only succeeded temporarily. For one reason or another I became less and less susceptible over time, and when I was 9 years old I was already an Atheist.