Other things my kids won't learn about, unless they want to explore it from the perspective of human superstitions or in fantasy stories:
Astrology
Witchcraft
Area 51
Scientology
Sasquatch
Vampires
Elves
Oh, yeah, and can't forget Eskimos
Of course, in the context of fantasy, all of this stuff is fine. But I don't think adults should tell kids that things that are clearly fantasy are, in fact, reality. Kids actually believe things that adults tell them, so I think you should try to tell the truth to kids as much as possible.