Really "The Christian and Sometimes Jewish Origins of Christian and Sometimes Jewish Things." The few times he remembers this isn't a book solely about Roman Catholicism (his background), he summarizes a few trite lines about something Islamic, or quotes a Confucian equivalent of the Golden Rule. The part about Egyptian monotheism is completely wrong: Egyptians didn't 'get' monotheism all of a sudden and just as suddenly stop. The pharaoh who decided to focus worship on Aten the Sun God was pretty despised by his people, who gladly commemorated his death by scratching his name and deeds off anything they could get their hands on. Back to the old ways!
Another book written by another dude who doesn't really stop to think that there were and still are other religions beyond the big three monotheisms and Hinduism. Little to no mention is ever made of paganism beyond the etymology of words (obvious ones, such as 'Hel' or 'Lord'); a quick summary of Hells are made late in the book that includes a single line about Tartarus, and another line on Niflheim, though no explanation is offered that these are for the worst offenders, that there were other afterlives in these worldviews.
I enjoyed most the style of the book - that this isn't a dictionary or encyclopedia, with bulleted listings and terse descriptions; rather a narrative that pulls similar topics together and invites you to keep reading beyond what you initially looked up. My favourite sections of course were the ones that discussed the origins of Yahweh and al-Lah in the pre-monotheistic pagan beliefs of local tribes and how beliefs were elaborated and added on to over the centuries.
Overall, just a 'meh' sort of book for anyone who isn't Roman Catholic, so lots of this is skim-worthy or skippable altogether. Expected so much more.