I love data and this book contains a lot of it: convincing (to me) survey data that suggests the evangelical movement isn't nearly as strong as it makes it out to be and is declining all the time.
One of the things that was most convincing to me was the section on child-rearing: that evangelicals tend to raise their children using a "strong-father" model, while most of the rest of the U.S. uses a "nurturant" model.
So the kind of God evangelicals worship is devalued by children raised in the nurturant model because they don't think of themselves as sinful or even as particularly disempowered. The leap of faith and the unquestioning obedience to biblical rules that evangelical faith rests on are also devalued -- replaced by questioning, self-scrutiny, logic, and reasoning...Parents are the first gods in our lives. When they say from our earliest memories, "You're right. It is more complicated," in response to our scrutiny of the rules, it's impossible to respect or love a God who would do less.
Maybe not impossible, but certainly far, far more difficult for a vast majority of people.
It's a fascinating book; if this kind of thing interests you, I highly recommend it.
Unlike Pride and Prejudice and Zombies, which was dreadful.