That’s a pretty naive thing to say. It’s not so black and white. You can say the words “this movie is pure fantasy, it isn’t real” to a child, but you have no idea how powerful a child’s imagination can be, how strong their hope can be. Have you ever heard of people dabbling in the occult? How do you think they start out? They watch movies like The Craft that not only glorify magic but also come straight out and say that it is real and it is out there. These kids go out there looking for real magic, refusing to believe that it’s all fake. And they get into very evil things. Moses wasn’t the only one who was able to make it rain locusts and turn the river into blood. Even ungodly magicians of Egypt were able to do those things.
If it came down to it, honestly, I’d rather have illiterate children in Heaven than children in Hell who can read. Granted, it won’t come down to that, because, thankfully, there’s plenty of holy books, even kids books, they can read that won’t be a danger to them.