I can tell you from my personal experience that the info there has helped me understand the differences between how people think in Brazil (where I come from) and how people think here in the US. Could it be me pattern matching? Possibly
I wouldn’t expect all of it to be true, but I would be very surprised if most of the sources the author provide are false or lack theory and tests, since he explain control groups and experiments in details.
I’m not that married to the book either, as I find some claims rather bold (like the Italy divide)
The title does sound catchy tho
Edit; the author’s main point is how the papal rule on monogamy changed Europe and its colonies to this day, which I didn’t capture on my main comment. Lots to unpack there