Ooh, they are insane. You can read many or all of them online. This one ("Dark Dungeons") is a favorite of mine.
Edit: As mentioned in the Wikipedia article, an earlier version of "Dark Dungeons" (the one that was my introduction to Chick tracts a couple decades ago) listed C. S. Lewis and J. R. R. Tolkien as occult authors whose books should be burned.
No link to chick.com is complete without mentioning these two things:
Dark Dungeons with MST3K-style snarking. This really improves it.
Lisa, which is no longer published or archived on the Chick Publications web site. It has some... interesting ideas about how one should deal with people who rape children. (Everything is okay after five minutes of prayer! No need to report it to the police! Lalala!)
There are some other great Chick tracts, but those are the cream of the crop.
This is our monthly thread for collecting these little gems and pearls of wisdom, rationality-related quotes you've seen recently, or had stored in your quotesfile for ages, and which might be handy to link to in one of our discussions.