I have been told many times; "It's not real!"
"What are you worried about?""

And I must reply; "Well, if it's not real, then why did God warn us against it so frequently?"

As I said, my fear is not that my children will practice witchcraft after reading Harry Potter, but that they would get the impression that God was warning us about something that is "Not Real", or worse, that "SOME" parts of the Bible can be disregarded as "myth."