The Economist's review of the book says, "Mr Johnson’s own research into 186 preindustrial cultures found that moralising religious beliefs were more prevalent in larger and more complex societies; these were more likely to be policed, use money and pay taxes."
It adds, "Mr Johnson does not seem a pious man himself. But unlike atheists such as Richard Dawkins and Sam Harris, he is not out to embarrass religious belief and chase its subscribers from the public square. The religious instinct is too deep-seated, he thinks. Instead, critics of superstition are best advised to work with the grain of human psychology rather than against it, finding more benevolent ways to satisfy human yearning for something “out there”."