My son's father is a Catholic zealot. I'm an atheist. When my child was merely 6, he made my son watch the passion. Also that summer he told my son that some lady "ate baby jesus's heart". When my child returned from his visitation he was horrified! He had nightmare every night for months. Sadly, not only does it continue but it is only getting worse. Now he tells him that "all the Jews murdered jesus". I have a MAJOR problem with this! I won't raise a bigot.
My parents were Baptist zealots. I was taught that catholism was a cult. Baptists hate the catholics. Probably some jealously over the drinking issue. So I know the bible inside and out. I have done my research. Religion just is not my cup of tea. Science totally works for me. I teach my kids ALL about the our wonderful scientific world. I also encourage them to do their own "experiments" and "exploring"
I have a major problem with religion. I have found it to monger hate and provide a safe haven to predators. That doesn't even begin to get into all the emotional abuse religions have inflected over thousands of years.
What parents, the zealots mainly, do not realize is that their children will eventually think for themselves. Granted my child can come to be for support when his dad gets nutty. But he is already picking up at the tender age of 8, that the STORIES his dad tells him are not only impossible but they just don't add up. Kids are smarter than adults realize. They just sometimes need someone in their life to actually say to them, "Well, what do you think?"