God has mellowed. The God that most Americans worship occasionally gets upset about abortion and gay marriage, but he is a softy compared with the Yahweh of the Hebrew Bible. That was a warrior God, savagely tribal, deeply insecure about his status and willing to commit mass murder to show off his powers. But at least Yahweh had strong moral views, occasionally enlightened ones, about how the Israelites should behave. His hunter-gatherer ancestors, by contrast, were doofus gods. Morally clueless, they were often yelled at by their people and tended toward quirky obsessions. One thunder god would get mad if people combed their hair during a storm or watched dogs mate.

In his brilliant new book, “The Evolution of God,” Robert Wright tells the story of how God grew up. He starts with the deities of hunter-­gatherer tribes, moves to those of chiefdoms and nations, then on to the polytheism of the early Israelites and the monotheism that followed, and then to the New Testament and the Koran, before finishing off with the modern multinational Gods of Judaism, Christianity and Islam. Wright’s tone is reasoned and careful, even hesitant, throughout, and it is nice to read about issues like the morality of Christ and the meaning of jihad without getting the feeling that you are being shouted at. His views, though, are provocative and controversial. There is something here to annoy almost everyone.

In sharp contrast to many contemporary secularists, Wright is bullish about monotheism. In “Nonzero: The Logic of Human Destiny” (2000), he argued that there is a moral direction to human history, that technological growth and expanding global interconnectedness have moved us toward ever more positive and mutually beneficial relationships with others. In “The Evolution of God,” Wright tells a similar story from a religious standpoint, proposing that the increasing goodness of God reflects the increasing goodness of our species. “As the scope of social organization grows, God tends to eventually catch up, drawing a larger expanse of humanity under his protection, or at least a larger expanse of humanity under his toleration.” Wright argues that each of the major Abrahamic faiths has been forced toward moral growth as it found itself interacting with other faiths on a multinational level, and that this expansion of the moral imagination reflects “a higher purpose, a transcendent moral order.”

Image Credit... Illustration by Chip Kidd

This sounds pro-religion, but don’t expect Pope Benedict XVI to be quoting from Wright’s book anytime soon. Wright makes it clear that he is tracking people’s conception of the divine, not the divine itself. He describes this as “a good news/bad news joke for traditionalist Christians, Muslims and Jews.” The bad news is that your God was born imperfect. The good news is that he doesn’t really exist.