I hoped this might have some funny if obvious jibes at the American fundamentalist industry. Not only is the humour funnier and darker than I expected, it's actually informative and well-argued. Quotes from the King James Version of the Bible are used throughout the book to illustrate the often cruel and barbaric principles that biblical literalists don't like to talk about. You can laugh at it, but if you're the target of this satire you just can't laugh it off.
The fictional Landover Baptist church takes that literalism to its logical conclusion. It embodies intolerance, homophobia, repression ("Widowers are given permission to almost masturbate"), anti-intellectualism (the methods of "Creation Science" get applied to all sorts of other scientific questions), hypocrisy, money-fixation and xenophobia ("America is now torturing foreigners: but is it enough?"). Some of this is over-the-top parody but some of it is only a slight exaggeration of things you can find people advocating in real life.