The End of Faith: Religion, Terror, and the Future of Reason

Sam Harris advances a single overarching argument across seven chapters, an epilogue, and an afterword: Religious faith, defined as belief in historical and metaphysical propositions without sufficient evidence, poses an existential threat to civilization and must be replaced by a rational approach to ethics and spirituality.

Harris opens with a vivid scenario: A young man boards a bus with a bomb beneath his overcoat, detonates himself, and kills over 20 people. His parents feel pride, believing he has gone to heaven. Nothing about the bomber's education or wealth can be inferred, yet his religion can be guessed with near certainty. This, Harris argues, demonstrates how religious belief uniquely motivates violence. He defines belief as a lever that moves nearly everything in a person's life. The world's competing holy books each claim exclusive infallibility, making intolerance intrinsic to every creed. A cultural taboo against criticizing faith obscures this root cause, as modern weapons make religious differences an existential threat.

A central target of the book is religious moderation. Harris contends that moderates bear a destructive dogma because their ideal of tolerance prevents serious criticism of literalist and extremist beliefs. Moderation does not arise from scripture, he argues, but from secular developments, including democratic politics, scientific advancement, and concern for human rights. He quotes passages from Deuteronomy, a book of the Hebrew Bible, commanding the stoning of anyone who advocates worship of other gods, passages that moderates simply ignore. From the perspective of scriptural literalists, moderates are failed fundamentalists.

Harris examines the nature of belief, arguing that religious beliefs are not a special category exempt from the standards of evidence that govern all other claims about the world. Beliefs evolved in service of action and must cohere logically for personal identity to remain intact. He dismantles the philosopher Pascal's wager—the argument that one should believe in God because the potential reward of eternal salvation outweighs any cost—and the philosopher Kierkegaard's "leap of faith," contending that one cannot genuinely believe something simply because it would be comforting to do so. He defines faith as what credulity becomes when it achieves escape velocity from the constraints of reasonableness and candor, and draws a parallel between religious belief and delusion, noting that beliefs lacking rational justification are called "religious" when common and "psychotic" when rare. Even ostensibly secular atrocities, he argues, such as those perpetrated by Soviet leader Joseph Stalin and Chinese leader Mao Zedong, were driven by cultic ideologies functionally equivalent to religious faith.

Harris presents historical case studies to demonstrate how Christian faith produced atrocities. He traces the Inquisition from its establishment in 1184, created to crush the Cathars, practitioners of an unorthodox dualistic theology. He documents the apparatus of torture used to extract confessions and traces the biblical justifications for persecution to Deuteronomy and Saint Augustine, who reasoned that if torture was appropriate for those who broke human laws, it was even more fitting for those who broke God's laws. He examines the witch hunts as a related phenomenon, noting that no actual confederacy of witches existed in medieval Europe.

Harris turns to anti-Semitism, arguing that it is intrinsic to both Christianity and Islam and rooted in theology rather than prejudice. He traces the demonization of Jews from the epistles of Paul, an early Christian apostle, through the medieval "blood libel," the belief that Jews required Christian blood for rituals. He argues that the Holocaust emerged directly from this theological tradition, citing research showing that two-thirds of prominent German anti-Semitic writers between 1861 and 1895 advocated exterminating Jews, decades before Nazi leader Adolf Hitler rose to power. He documents the Catholic Church's complicity, including opening genealogical records to help trace Jewish ancestry and helping officers of the SS, the Nazi paramilitary organization, escape to South America after the war. He notes that the astronomer Galileo Galilei was not absolved of heresy until 1992, while no leader of the Third Reich was ever excommunicated.

In his longest chapter, Harris argues that Islam poses a unique danger because of its specific doctrines. He contends that the world confronts Muslim rather than Jain terrorists because Jainism, an Indian religion emphasizing nonviolence, contains nothing likely to inspire suicidal violence. He analyzes jihad, or holy war, citing the historian Bernard Lewis's observation that jihad constitutes an unambiguous call to world conquest. He compiles Koranic passages commanding violence against unbelievers and presents 2002 Pew Research Center data showing that, when "rarely justified" responses are included, large majorities in many Muslim-majority countries cannot say that suicide bombing of civilian targets is never justified. He also argues that beliefs about martyrdom undermine nuclear deterrence, since a regime that glorifies death cannot be reliably deterred by the threat of it.

Harris critiques Noam Chomsky, a prominent political critic, for drawing a moral equivalence between U.S. actions and the September 11 attacks, arguing that Chomsky ignores the crucial distinction of intent. He introduces a thought experiment involving "perfect weapons" that could target specific individuals without harming others, arguing that Western leaders would not use such weapons against civilians, while the Iraqi dictator Saddam Hussein or Al Qaeda leader Osama bin Laden would have.

Turning to the United States, Harris argues that religion's influence on domestic policy is deeply damaging. He catalogs officials whose religious beliefs shape policy, including Supreme Court Justice Antonin Scalia's argument that government derives moral authority from God. Harris critiques U.S. drug policy as a judicial expression of the Christian concept of sin, noting that alcohol is more dangerous than marijuana yet remains legal, while hundreds of thousands are imprisoned for nonviolent drug offenses. He argues that opposition to embryonic stem-cell research, based on the belief that a fertilized egg deserves full human protections, is divorced from any reasonable understanding of the experience of a blastocyst, a very early-stage embryo. He contends that requiring one-third of U.S. AIDS prevention funds for Africa to be spent on abstinence education rather than condom distribution could cost millions of lives.

Harris devotes a chapter to arguing that a rational, scientific approach to ethics is possible, grounded in the happiness and suffering of sentient beings rather than in religious dogma. He critiques moral relativism as self-contradictory, since most relativists believe tolerance is better than bigotry, itself an absolute moral claim. He discusses "honor killing," the murder of women and girls by male relatives for perceived sexual indiscretions, as a case study in moral failure. He examines the ethics of torture through the "ticking bomb" scenario, arguing that there is no principled distinction between torturing a suspected terrorist and accepting the collateral deaths of innocent children in warfare.

In his final chapter, Harris argues that genuine spiritual experience is possible and valuable but requires no faith in untestable propositions. Many contemplative traditions converge on the insight that the ordinary sense of self, the feeling of being a separate "I," is an illusion produced by the brain that can be interrupted through meditation. Harris defines meditation as any practice by which subject/object dualism—the felt sense that a knowing self stands apart from the things it perceives—can be made to vanish while consciousness remains vividly aware. He argues that Eastern traditions, Buddhism in particular, have developed far more sophisticated methods for investigating consciousness than anything found in the Abrahamic religions (Judaism, Christianity, and Islam) or Western philosophy.

Harris concludes that mysticism is a rational enterprise while religion is not. A kernel of truth lies at the heart of religion: Spiritual experience, ethical behavior, and strong communities are essential for human happiness. But religious traditions are intellectually defunct and politically ruinous. The contest between religions is zero-sum, and no real foundation exists within Christianity, Islam, or Judaism for genuine tolerance. In an afterword, Harris responds to common criticisms and defends meditation as an empirical practice rather than an act of faith.