Yea atheist writers tend to have a good sense of humor. The Dawkins book is very funny as well, I'm sure you would love it.
And to Ran-The book doesn't necessarily debate facts for religion, because, uhhhhh, there aren't any. But it does present all the arguments, which he precedes to sarcastically tear down in an intelligent way. If you wouldn't find it intellectually stimulating you would probably find it humorous in the least. He definitely doesn't "soften up" anything. You're average Jesus freak would get PISSED at this book.