For me, this stuff is real small potatoes... I'm more concerned with the kids engaging in oral sex on the schoolbus, in the gym, the sudden outbreak of lesbianism among a good percentage of the middle school kids, problems like that. This all happens in my neck of the woods, every day.
If my kid has a good grounding in the faith, Harry Potter isn't going to be a threat to his/her faith in God. JMO.