I think some fundies would have a problem with it specifically because it's cutesy - I remember reading people being anti Harry Potter because it trivialized what they saw as black, satanic magic
Take your Harry Potter example. The people who are anti-Harry Potter aren't really against it because it trivializes black magic. That's just a rationalization. These people certainly don't support something like the works of Aleister Crowley, even though they're much more serious about their treatment of the occult. They're against it because it contains -- in their view -- black, satanic magic.