This books is chock full of bad news for secularists, atheists, and liberals in general.
Their days are numbered.
There is little future in general for secularists; Kaufman points out that they "have a low fertility rate 1.64" (p 92) while the religious marry and have children.
The news is even worse for those who claim to be atheists, whose reproduction rate may be the lowest in the world, at .85. From the statistics, atheists have no future at all (according to the research children tend to take on the beliefs of their parents).
In Europe, statistics bear out that the religiously devout reproduce, while the nonreligious are, apparently, more interested in making sure their lives are full of pleasure instead of full of diapers and toys. "Today, evangelicals, Pentecostalists and charismatics make up more than 8 percent of the European population, twice as numerous as Muslims, and they are increasing at the same rate," (p 159).
Statistics also bear out that "those without children tend to leave church as they enter adulthood, but those with children remain in the pews" (p 163).
This situation is starkest in Israel, where the religious Haredim will eventually overwhelm the secularist Jews.
This was an eye opening book. Anyone interested in the subject will also want to read Goldman's "How Civilizations Die" which covers the demographic decline world wide, including the Muslim and less developed areas.
Here is a snip from my review of that book: The ancient world clearly suffered from shocking population declines, which many have argued caused their eventual ruin. Sparta according to Aristotle "'sank under a single defeat: the want of men was their ruin'" (p 120) since their original population of 10,000 had fallen to 1,000.
Female infanticide was common. Archaeologists found that a survey of 79 families in Miletus there were "188 sons but only 28 daughters...Another survey at Eretria...reports that only one of twelve families had two sons, and almost none had two daughters" (p 130).
Without women, and without children, how could their civilization continue?
And, of course, famously, the emperor Augustus tried to force the elite to marry and bear children, another sign of a similar problem for Rome.
For a while, perhaps, the new rich from other countries could repopulate the elite. But as Mommsen wrote about Rome, "'Celibacy and childlessness became more and more common, especially among the upper classes'" (p 132).
Christianity, as Judaism had before it, insisted that infanticide was a grave moral evil, and forbade abortion and contraception. Perhaps it is no wonder that Christianity eventually took over the empire.