This was interesting and I am not at all sorry I read it, but it seemed very much to be Inhof's personal opinions about things with some statistical support rather than actual data-driven history -- I wish he had put one of those introductory chapters where he examines his own beliefs and assumptions, because I felt like there was a lot of unexamined 'correlation proves X was caused by Y' based on what Inhof found obvious about the world, which of course was not at all obvious to me.
That being said, his sketch of village demographics in this particular part of what is now Germany was really fascinating, and there were some places where the numbers did seem to be saying something new & interesting -- I particularly remember the differences in the number of children & frequency of pregnancies in various areas and how that correlated with religious beliefs and why it might have worked that way.