The Good Book of Human Nature

Evolutionary biologist Carel van Schaik and historian Kai Michel, both agnostics, propose that the Bible is the most important document of human cultural evolution. Drawing on cognitive science, evolutionary biology, and anthropology, they read the Bible as humanity's diary, chronicling the problems Homo sapiens faced after adopting a sedentary way of life roughly 10,000 to 12,000 years ago and the cultural solutions people devised to cope with them.

The authors identify the Neolithic Revolution, the shift from nomadic foraging to farming, as the decisive turning point in human history. While this transition enabled population growth, it also brought catastrophic collateral damage: epidemic disease, violence, social inequality, and the subjugation of women. Because biological evolution was too slow to produce adaptations, culture filled the gap, generating a "cultural big bang" of rules, rituals, and institutions. The authors propose a "cultural-protection hypothesis": Much of what we attribute to religion began as crisis management aimed at protecting people from epidemics and catastrophes. They develop a model of three human natures: first nature (innate moral intuitions shaped by hunter-gatherer life), second nature (culturally transmitted habits internalized through upbringing), and third nature (rational, consciously adopted rules that often conflict with first-nature impulses). The divergence between first-nature preferences and post-sedentarization conditions, termed "mismatch," explains why biblical stories continue to resonate.

The Bible is not a single divinely authored work but a composite anthology assembled over roughly 800 years (ca. 900–100 BCE) by anonymous authors drawing on far older oral traditions. The repeated conquests of the small kingdoms of Israel and Judah proved formative for its development.

The authors begin with Genesis, arguing that it documents the problems following the Neolithic Revolution. The story of Adam and Eve reflects three core themes: the invention of private property (God's prohibition mirrors the concept that resources could be monopolized), the oppression of women through patrilocal marriage (in which wives moved into the husband's kin group) and restrictions on female sexuality, and the pain of childbirth as a biological mismatch (agricultural diets shrank women's bodies while infant head size remained the same). The story of Cain and Abel represents the inevitable consequence of a property-based society in which inheritance must pass to a single heir, with Cain's violence reflecting structural inequity rather than personal depravity. The flood narrative invokes the Hyperactive Agency Detection Device (HADD), a cognitive mechanism causing humans to perceive agents behind events, to explain how disasters were attributed to divine punishment. Proportionality bias—the tendency to seek causes as dramatic as their effects—promoted minor spirits to powerful gods, and the invention of sin followed: If catastrophes are divine punishments, human wrongdoing must be the cause. The patriarchal narratives of Abraham, Isaac, Jacob, and Joseph illustrate the conflicts generated by polygyny (one man having multiple wives) and private property: Competition among wives, half-brothers, and fathers and sons produces relentless conflict.

In Part II, the authors turn to the Torah, the first five books of the Hebrew Bible. They regard the Torah's 613 commandments as the Bible's true masterpiece. The historical Moses was likely a minor figure whose biography was constructed retrospectively. The Torah differs from other ancient Near Eastern legal codes by extending divine regulation into personal hygiene, sexuality, and diet, and by presenting all laws as God's own will. The authors classify these laws into categories: protection against violence (the "eye for an eye" as a civilizing limit on vendetta), protection against disease (clean/unclean distinctions as infection control), system-securing rules (dietary laws combining health and identity), strategies for undetected sins (the scapegoat ritual), and sacrificial practices. God functions as a heuristic tool: The false premise that epidemics are divine punishment nonetheless initiates effective prevention.

The authors reconstruct Yahweh's evolution from minor deity to transcendent God. Yahweh's advantage was that he was worshipped in both kingdoms, Israel and Judah, giving him two chances at survival. When Assyria destroyed the northern kingdom in 722 BCE, Yahweh survived in the south, and the Assyrian ideology of absolute sovereignty was transferred onto him, producing the jealous God demanding exclusive loyalty. When Babylon destroyed the southern kingdom and its temple in 587 BCE, Yahweh was forced to become invisible, abstract, and indestructible; monolatry (worship of one god among many) evolved into full monotheism, and the Torah became a "portable homeland." The persistent Israelite resistance to this development reflects a collision between rational, institutional religion and innate belief in multiple supernatural beings. The Torah's three major legacies are increased cooperation, rationalization (a single predictable God laying groundwork for science), and violence (monotheism's insistence on one truth requiring constant proof of commitment).

Part III examines the books of Kings and the Prophets. Drawing on the medieval Arab historian Ibn Khaldun's concept of asabiya (group solidarity), the authors trace a cyclical pattern in which Saul and David as warrior possessed strong solidarity, David as king built civilization but corroded it, and Solomon destroyed cohesion through luxury. David's taking of Bathsheba, the wife of another man, and the fratricidal struggles among his sons replicated the patriarchal conflicts of Genesis on a royal scale, illustrating the Bible's protopolitical conclusion that selfish, lawless rulers destroy the state. The biblical prophets are literary constructs whose dark predictions were verified by history through survivorship bias—the tendency for failed predictions to be forgotten while successful ones are remembered. Stripped of magical tools, the prophets became altruists who transformed Yahweh into the first thoroughly moral god in history, yet divine violence remained, reflecting the real catastrophes attributed to him as the only available cause.

Part IV examines the Ketuvim, or Writings. The Psalms introduce God as an intimate personal protector, integrating intuitive religion into the Hebrew Bible and creating a hybrid that satisfied both societal and individual needs. The book of Job dramatizes friction between intellectual religion's claim that suffering implies guilt and intuitive religion's demand for fairness, demonstrating that no satisfactory earthly resolution exists for undeserved suffering. The book of Daniel, written amid persecution by the Seleucids (the Hellenistic dynasty ruling the region) and the Maccabean Revolt (the Jewish uprising against Seleucid rule), introduces the first biblical concept of resurrection, filling the afterworldly vacuum that monotheism's elimination of ancestor worship had created.

In Part V, the authors argue that Christianity represents the culmination of cumulative cultural evolution. Very little is historically certain about Jesus of Nazareth, but the evangelists embellished his story with miracles and fulfillment references to Hebrew Bible prophecy. The resurrection is the decisive credibility-enhancing display: a mostly familiar idea containing one supernatural violation, appearing at the perfect historical moment. The authors identify two faces of Jesus: an apocalyptic warrior who tightened group rules for the final battle against evil, and an intuitive, hunter-gatherer ideal who lives in an egalitarian community, rejects hierarchy, and includes women. When the apocalypse failed to materialize, salvation was individualized, Jesus was deified, and the Virgin Mary, Jesus's mother, provided a female face for the divine. Saints reintroduced ancestor worship, and the devil consolidated as Lord of Evil, enabling God to become entirely good. Christianity became a "Swiss army knife" religion satisfying every dimension of human nature.

In their final chapter, the authors argue that science emerged as the legitimate heir of intellectual religion. The church father Augustine's concept of God's "two books," the Bible and the Book of Nature, created a framework for inquiry, and key figures of the scientific revolution such as Johannes Kepler, Galileo Galilei, and Isaac Newton were deeply religious. The secularization thesis has proven incorrect because it conflates intellectual religion, which science can replace, with intuitive religion, which is rooted in biology and continues to thrive while intellectualized churches decline.

The authors conclude that the Bible documents a dialectical process between biology and culture. The golden rule, love thy neighbor, is the "first and last commandment of humanity," and the Bible's having to state it explicitly proves it had ceased to be self-evident in post-sedentarization societies. The Bible was a work in progress for a thousand years, and its enduring power derives from its engagement with the mismatch problems that continue to define the human condition.