The historical record does not support "religion poisons everything." The Spanish Inquisition killed approximately 3,000–5,000 people over 350 years. Explicitly atheist regimes in the 20th century killed over 100 million. The removal of the Imago Dei — the conviction that every person bears God's image — removes the absolute barrier to treating human beings as expendable.
Key claims
—Spanish Inquisition: ~3,000–5,000 executions over 350 years — not the hundreds of thousands often assumed
—Stalin: ~20–60 million deaths under explicitly atheist, anti-religious Marxist-Leninist ideology
—Mao: ~45–78 million deaths; Cultural Revolution specifically targeted and destroyed religion
—Pol Pot: ~1.7–2.5 million deaths — 25% of Cambodia's population — under explicitly atheist Khmer Rouge
—D'Souza: the 20th century atheist regimes removed the Imago Dei and thereby removed the absolute barrier to treating humans as expendable
—The standard that convicts the Crusades must convict the Soviet gulags — applied consistently, atheism's record is far worse
Christopher Hitchens's subtitle — "How Religion Poisons Everything" — is the most famous formulation of the claim that religion, and Christianity specifically, is a net negative for human civilization: a cause of violence, oppression, ignorance, and suffering that would leave the world better off if eliminated. This claim is presented as empirical. Examined empirically, it fails.
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The actual historical record
The indictment against religion typically focuses on: the Crusades, the Inquisition, the witch trials, religious wars in Europe, and contemporary religious extremism. Each of these episodes is real and some involved genuine atrocities. But the historical case against religion requires selective quotation from a very long record — and the record, taken whole, tells a different story.
The Crusades were a complex series of military campaigns spanning approximately 200 years (1095–1291), motivated by a mixture of religious conviction, political calculation, and economic interest. Their death toll is estimated by historians at between 1 and 3 million — a terrible figure. It is also a figure dwarfed by the death tolls of secular conflicts in the 20th century alone.
Moreover, the Crusades were partly a response to an expansionist Islamic conquest that had overrun Christian territories across North Africa, the Middle East, and into Europe — culminating in the Islamic conquest of Constantinople in 1453. The history of the Crusades is not one of unprovoked Christian aggression against peaceful populations.
The Spanish Inquisition is perhaps the most reliably overestimated atrocity in popular historical memory. Modern historians, using surviving Inquisition records (which are unusually complete), estimate that approximately 3,000–5,000 people were executed over the entire 350-year period of the Spanish Inquisition. This is not a defense of the Inquisition — it was an unjust institution. But it is a correction of the common assumption that the Inquisition killed hundreds of thousands. It did not.
Religious wars in Europe (primarily the Thirty Years' War, 1618–1648) were devastating — the Thirty Years' War killed approximately 8 million people. But historians of the period are clear that these wars had complex political, dynastic, and economic causes that were not reducible to theological disagreement. They were not simply wars of religion.
The pattern in each case is: real historical atrocities, attributed entirely to religion, with the political, economic, and cultural factors either ignored or minimized. The honest historical assessment is more complex.
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The atheist century — the 20th century's catastrophe
The most consequential fact in the historical case about religion and violence is the one the New Atheists are most eager to explain away: the 20th century.
The worst atrocities in human history were committed by explicitly atheist regimes, operating under ideologies that were explicitly anti-religious, in the name of explicitly secular ideals.
Soviet Union under Stalin: Approximately 20–60 million deaths through the Gulag system, forced collectivization, deliberate famine (Holodomor), and political executions. The Soviet state was explicitly and militantly atheist — religion was persecuted, churches were destroyed, priests were executed, and the promotion of atheism was a central state objective. The ideology driving the atrocities was not incidentally atheist — it was constitutively atheist: Marxism-Leninism's rejection of religion as "the opium of the people" was foundational to its program.
China under Mao Zedong: Approximately 45–78 million deaths through the Great Leap Forward, the Cultural Revolution, and associated famines and executions. The Chinese Communist Party was explicitly atheist; the Cultural Revolution specifically targeted religion, destroying temples, executing clergy, and attempting to eradicate religious belief entirely.
Cambodia under Pol Pot: Approximately 1.7–2.5 million deaths — 25% of the entire Cambodian population — in four years. The Khmer Rouge was explicitly atheist, explicitly anti-religious, and specifically targeted Buddhist monks and religious institutions.
The total death toll of explicitly atheist regimes in the 20th century exceeds 100 million by most estimates.
The atheist response is typically twofold: first, these regimes did not commit atrocities "in the name of atheism" — they committed them in the name of political ideology; second, a causal connection between atheism and the atrocities has not been established.
Both responses miss the relevant point. The point is not that atheism logically entails mass murder. It does not. The point is the double standard: if the Crusades, conducted by Christians and justified with Christian rhetoric, count as evidence against Christianity, then the Soviet gulags, conducted by atheists under an ideology whose rejection of God was foundational, must count as evidence against atheism. The standard that convicts Christianity must apply equally. And when it does, the scale of atheist atrocities in the 20th century dwarfs any religious violence in any century.
The crimes of atheism have generally been perpetrated through a hubristic doctrine that amounts to a kind of atheist theology. This doctrine, pervasive in the French Revolution and Marxist ideology, holds that if God does not exist, then we must create human beings who are gods — that if heaven does not exist, then we can create heaven on earth. The attempt to build the New Jerusalem and the New Man led, in the 20th century, to the gulag and the gas chamber. This is not a coincidence. It is a consequence.
The deeper point is what D'Souza is gesturing toward: when you remove the Imago Dei — the conviction that every human being bears the image of God and therefore has inherent, inalienable worth — the justification for treating human beings as instruments of historical progress or political ideology becomes available. The 20th century's atheist regimes did not treat their victims as persons made in God's image. They treated them as obstacles, statistics, or material for social engineering. The removal of God did not produce liberation. It removed the only absolute barrier to treating human beings as expendable.
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The positive case — what Christianity built
The full treatment of this argument is in the Why Christianity Foundation, Section 12. The brief version here is essential context for the "religion poisons everything" claim:
Christianity gave the world: the concept of universal human dignity (Imago Dei), the abolition movement driven explicitly by the conviction that every human bears God's image, the first hospitals (Basil of Caesarea, 372 AD), the first universities (Bologna, Oxford, Cambridge, Paris — all Christian foundations), modern science (Newton, Faraday, Mendel, Lemaître — all devout Christians motivated by theological conviction), international human rights law (the Universal Declaration of Human Rights, 1948, drafted largely by Christians drawing on Christian anthropology), and the largest network of charitable, educational, and medical institutions in human history.
Hitchens's claim that "religion poisons everything" is, as a summary of the historical record, simply false. It is selective history in service of a predetermined conclusion.