Well, I have adult Christian friends who roleplay their little hearts out, who choose not to play games with overtly magical/supernatural themes. (Bearing in mind the huge spectrum.)
As you know, I don’t have a problem with it for myself, but I have no problem with them not wanting to.
I also know of some parents who don’t let their children read Harry Potter for much the same reason. And that may seem like an over reaction. But I am not their parents… And in the grand scheme of things, it really doesn’t matter.
There’s plenty of other good books (and games) out there.
Perhaps as they get older, it will become less of an issue.
And in the meantime, maybe some good conversation can come out of it… 