A whole site dedicated to crazy kid beliefs,
http://www.iusedtobelieve.com/ (http://www.iusedtobelieve.com/)
I used to believe a lot of odd things as a kid and even as a teenager. Anyway this site made me crack up, because some of this stuff is just funny and feel a lot better because I'm not the only one out there who used to believe some weird stuff.
There's a whole section on religion which is pretty amusing.
I was once told about this thing called puberty (i was about 7 at the time) but i mistook what it actually meant because for a few years after, i believed women turned into men and men turned into women during this crucial stage in human development.
I was really looking forward to becoming a woman when i was an adult. Haha.