This may already be a meme - but I like the idea and intend to act upon it. The next time you are in a bookstore or library do one of the following:
1. Move a Bible to the Mythology section
2. Move a Book of Mormon to the Fantasy section
3. Move a Koran to the Fiction section
4. Move any Scientology text next to the rest of the L. Ron Hubbard books in the Science Fiction section
Have fun - mix it up. Just one book - every time you go. If enough of us start doing it, people will begin to notice. It's not as if we're burning books - actually, it could be said we are simply lending a hand.