The Evolution of God

Robert Wright opens with a personal anecdote: after publishing The Moral Animal, which argued that human morality is a product of natural selection, he was denounced from a Baptist pulpit. He frames the book's central paradox: Although he approaches religion from a "materialist" standpoint, explaining its origins through human nature, politics, economics, and technology, this materialist account actually points toward the validity of a religious worldview. Gods arose as illusions, but the story of how those illusions evolved suggests something that could meaningfully be called divinity. Wright identifies two urgent questions the book will address: whether the Judeo-Christian West and the Muslim world can coexist, and whether religion can be reconciled with science.

Wright begins with "primitive" religion, drawing on anthropological records of hunter-gatherer societies. He sides broadly with the nineteenth-century anthropologist Edward Tylor, who proposed that "animism," the attribution of souls to all things, was the primordial form of religion and a rational attempt to explain the world. Wright notes that hunter-gatherer gods are not moral authorities: They punish ritual breaches, not theft or violence, because social order in small villages is maintained through kinship and mutual dependence. Shamans, the earliest religious specialists, claimed privileged access to supernatural forces and served as proto-political figures, sometimes fomenting intergroup conflict by blaming rival shamans for misfortune. Wright observes that religion's role as a source of intergroup hostility was present from the beginning.

As societies grew into agricultural chiefdoms, religion transformed. Using Polynesian chiefdoms as his primary example, Wright shows how political and religious authority fused: Chiefs derived legitimacy through a divine connection, functioning as conduits of mana (divine power), while tapu (the origin of the word "taboo") formalized social norms with supernatural sanctions. For the first time, gods punished theft, dishonesty, and family discord, filling a gap that arose as communities grew too large for informal social policing.

In the earliest state-level civilizations, Wright traces two movements toward monotheism. The Babylonian god Marduk gradually absorbed other gods' identities, while the Egyptian pharaoh Akhenaten promoted the sun-disc deity Aten to sole godhood. Both reflected political ambitions as much as theological insight. Wright introduces a principle central to the book: When peoples benefit from cooperation, a non-zero-sum dynamic in which both sides gain, their gods tend to find common ground. As Mesopotamian city-states became economically interdependent, their local gods coalesced into a regionally accepted pantheon.

Wright then devotes sustained attention to Abrahamic monotheism. Archaeological evidence undermines the biblical conquest narrative: The Israelites appear to have been Canaanites who emerged from within Canaanite society during economic disruptions at the end of the Bronze Age, around the twelfth century BCE. Yahweh inherited traits from both El, head of the Canaanite pantheon, and Baal, the storm god, and later editors obscured this polytheistic heritage by rendering subordinate gods' names as common nouns.

The movement from polytheism through monolatry, the exclusive worship of one god without denying others' existence, to full monotheism was driven primarily by political forces. Wright identifies King Josiah (c. 640 BCE) as the "godfather of monotheism," who centralized worship in Jerusalem and harnessed nationalist sentiment to consolidate power. The catastrophe of the Babylonian exile in 586 BCE then paradoxically intensified devotion to Yahweh: Exiled intellectuals chose to believe Yahweh had orchestrated the disaster as punishment, implying he was more powerful than anyone had imagined. Wright identifies the anonymous exilic author of Isaiah chapters 40 through 55, known as Second Isaiah, as the Bible's first unambiguously monotheistic voice. He challenges standard readings of this text's universalism, arguing that it is largely a vision of retribution. Yet Wright adds that monotheism has proven "morally speaking, a very malleable thing," capable of becoming a fount of tolerance when circumstances are favorable.

To illustrate this malleability, Wright turns to Philo of Alexandria, a Jewish thinker of the first century BCE to the first century CE who inhabited overlapping Jewish, Greek, and Roman worlds. Philo's central concept was the Logos, both the reasoning principle in the universe and a divine algorithm guiding history toward moral progress. Wright sketches a modern rendering: Technological evolution places people in non-zero-sum relationships with an ever-expanding circle of others, and the rational response is tolerance and cooperation. This process, he suggests, could be called the Logos at work.

Turning to Christianity, Wright uses the "rule of theological inconvenience," the principle that biblical claims at odds with their authors' theology are likelier to be historical, to argue that the real Jesus was an apocalyptic Jewish prophet whose moral concern was primarily for fellow Israelites. The universally compassionate Jesus, Wright contends, was a post-Crucifixion creation. The apostle Paul, not Jesus, was the primary architect of Christian brotherly love, driven by the practical demands of building a multinational organization. Paul's openness to Gentile converts exploited network externalities, a dynamic in which each new member increases the value of the network for all members, giving inclusive Christianity a competitive edge over more exclusive rivals. Wright traces the evolution of the Christian concept of salvation, showing that Jesus's original message concerned God's kingdom on earth. The idea of immediate heavenly reward developed decades later as the promised kingdom failed to materialize and Christianity competed with Egyptian and Greek cults already offering blissful afterlives.

Wright's account of Islam argues that the Koran's moral fluctuations become comprehensible when read in the chronological order of Muhammad's career. During his decade as a marginalized prophet in Mecca, Muhammad counseled restraint and tolerance. After migrating to Medina, he became a political leader whose conflicts with Jewish tribes were driven more by political than theological factors. Wright argues that the doctrine of jihad has no solid grounding in the Koran: The noun appears only four times, the martial verses are circumscribed to specific conflicts, and the famous "Sword verse" actually refers to polytheists in a particular war. The doctrine of offensive holy war was constructed by later jurists who drew on the hadith, oral traditions about Muhammad's sayings that were vulnerable to fabrication.

In his concluding chapters, Wright argues that the salvation of the global social system depends on expanding the "moral imagination," the capacity to identify with others' perspectives. The human mind, shaped by natural selection for hunter-gatherer life, often fails to perceive non-zero-sum dynamics in the modern world, and the growing lethality of weapons technology makes draining intergroup hatred a matter of urgent self-interest. Wright contends that all three Abrahamic faiths have exaggerated their historical distinctiveness, yet their scriptures collectively reveal a moral order: As the scope of non-zero-sumness expands, humanity is pushed toward wider circles of moral consideration. In an appendix, Wright explains the cognitive roots of religion through evolutionary psychology, arguing that religion is not a direct genetic adaptation but a by-product of mental traits, such as a predisposition to detect intentional agents behind ambiguous events, that evolved for nonreligious purposes and were then harnessed by cultural evolution. In an afterword, he compares belief in God to physicists' belief in electrons: Both posit unseen sources of observed patterns, and both involve imperfect conceptions of something ultimately inconceivable. He suggests that love best characterizes the divine, since the expansion of empathetic understanding across ever wider human circles is both a manifestation of the moral order and a path toward moral truth.