Carpenter's work demands respect. It also elicits if not demands aggravation.
There is much to appreciate here. He's done his homework, historically and doctrinally. He understands the finer points of both in relation to fundamentalism, even if he doesn't hold them and/or belittles them. And it is just here that the aggravation enters in. This is not just a history book. It is an analysis of how a weakening fundamentalism turned into the rise of Billy Graham and the religious right. As an historically based analysis, some opinion is fair game. I accept that. But Carpenter goes beyond that to routinely state his opinion about positions/doctrines that have no place in such a book. In so doing, he makes sweeping statements of the negative kind about our (fundamentalist's) doctrine and practice that are unkind, unfair, and unscriptural. Additionally, he hints/states that the transition of fundamentalism into evangelicalism was/is a good thing. I strenuously reject such. So there's that.
Having said that, the book is still eminently worth reading for its historical content alone. I'm a decently educated student of the fundamentalist movement, and repeatedly I ran across historical context of which I was unaware. I really, really appreciate any book that brings facts to the table, facts that inform our understanding of the past, our approach to the present, and our plans for the future. And Carpenter's book does that. It brings historical fact/context, boatloads of it.
So read it, but prepare to be aggravated while you do.