Anyone who was raised in a religious family can relate to the picture on the left. It's one thing for kids to be taught to believe in innocuous fantasies, such as Santa Claus. It is quite another to add to childhood fears and reinforce the idea that ghosts, demons, evil spirits, etc., literally exist.
People tend to forget that the comforting lies of religion come with a dark side. Traditional religion, in attempting to deal with the problem of evil, has created a host of boogeymen over the centuries. In my opinion, teaching children to fear the unseen world is tantamount to child abuse.
I really don't blame my parents, because they believed what they taught me. However, what I want for my children is a world of science where they can laugh at childish tales of the supernatural.