Did religion fight science? The honest answer is: sometimes, and the record of those collisions is worth knowing. But honesty cuts both ways, so let’s start with the part of the story that complicates the popular version.
First, Credit Where It’s Due
For most of history, religious institutions were among science’s biggest patrons. Medieval monasteries preserved classical texts. The great European universities (Bologna, Paris, Oxford) grew out of church schools. Jesuit priests ran world-class observatories and did serious astronomy for centuries. Gregor Mendel, the founder of genetics, was an Augustinian friar who did his famous pea experiments in a monastery garden. Georges Lemaître, the physicist who first proposed what became the Big Bang theory, was a Catholic priest. And the Islamic world’s House of Wisdom in Baghdad preserved Greek learning and pushed mathematics, astronomy, and medicine forward for centuries.
Historians of science today largely reject the old “conflict thesis,” the idea that religion and science have been locked in perpetual war. The real history is messier: long stretches of partnership, punctuated by sharp collisions whenever a specific discovery contradicted a specific doctrine.
Those collisions are the interesting part. Because when they happened, they followed a pattern.
The Documented Collisions
Galileo and the Moving Earth
Notice what the dispute was actually about. Nobody claimed Galileo’s observations were faked. The problem was that the Bible seemed to describe a stationary earth (Joshua commands the sun, not the earth, to stand still), and the observations contradicted the accepted reading. Faced with a choice between revising the interpretation and silencing the astronomer, the authorities of that moment chose the astronomer. The Church formally acknowledged the error, but not until 1992.
Giordano Bruno
Giordano Bruno, a former Dominican friar, speculated about an infinite universe filled with other worlds. The Roman Inquisition convicted him of heresy and burned him at the stake in 1600. Honesty requires a caveat here: the charges centered mainly on theological heresies (he denied core doctrines like the Trinity), not his cosmology alone, so Bruno isn’t the clean “martyr for science” he’s sometimes made out to be. But the underlying fact stands: a man was executed by a religious court for holding forbidden ideas about reality. That’s the mechanism that matters, whatever the mix of charges.
Evolution
Darwin published On the Origin of Species in 1859, proposing that life’s apparent design came from natural selection rather than a designer. The reaction was immediate and lasting. The famous 1860 Oxford debate pitted Thomas Huxley against Bishop Samuel Wilberforce. In 1925, Tennessee prosecuted schoolteacher John Scopes for teaching evolution, and battles over evolution in public schools continued into the 2000s (the Dover intelligent design trial was decided in 2005).
The evidence for evolution is now about as solid as evidence gets: fossils, DNA, and speciation observed in real time. Yet Gallup found in 2024 that 37% of Americans still believe God created humans in their present form within roughly the last 10,000 years, and that view tracks religious identification and church attendance closely. A century and a half after Darwin, the single strongest predictor of rejecting one of biology’s best-established findings is religious commitment. That correlation is the tell.
The Age of the Earth
In the 1650s, Archbishop James Ussher added up biblical genealogies and calculated that creation happened in 4004 BCE. His date was printed in the margins of English Bibles for two centuries. When 19th-century geologists read rock strata and concluded the earth had to be vastly older, the resistance came from those defending the genealogical math. Modern measurement puts the earth at about 4.54 billion years old, off from Ussher’s figure by a factor of roughly 750,000. Young-earth belief persists today in exactly the communities where the older interpretation is still taught as fact.
Embryonic Stem Cell Research
This one is recent and subtler, because it’s not a dispute about facts. In the 2000s, research on embryonic stem cells (with potential applications for Parkinson’s, spinal injury, and more) was restricted in the United States and elsewhere, largely due to religiously grounded objections that an embryo has the moral status of a person. That’s a philosophical claim, and people can hold it sincerely. The point for this page is narrower: a position derived from theology, not from evidence, constrained what scientists were allowed to investigate. Whether you think the restriction was right or wrong, that’s religious doctrine steering research.
What About Islam’s Golden Age?
From roughly the 8th to the 13th centuries, the Islamic world led the planet in mathematics, astronomy, and medicine. A popular story says the theologian al-Ghazali killed that golden age by attacking philosophy in his book The Incoherence of the Philosophers. We should be careful with this one: historians genuinely dispute it. Serious scholarship has documented sophisticated Islamic astronomy continuing for centuries after al-Ghazali, and the decline (to whatever extent there was one) had political and economic causes too, including the Mongol destruction of Baghdad in 1258. The simple “one theologian ended science” story overclaims, and we won’t repeat it here. What’s fair to say is that in the long run, institutional religious conservatism in many parts of the world made empirical inquiry harder, not easier, and that pattern isn’t unique to any one faith.
The Pattern in the Collisions
Set the exaggerations aside and look at what the well-documented cases have in common. The conflicts were never random. Religious institutions didn’t oppose metallurgy, optics, or navigation. Opposition concentrated on exactly the discoveries that contradicted specific doctrinal claims: the earth’s place in the cosmos, the origin of species, the age of the world.
And in every collision, the institution faced the same choice: revise the interpretation of scripture, or resist the finding. Resistance usually came first, sometimes for decades or centuries, and revision came only after the evidence became undeniable. Heliocentrism, the old earth, and evolution are each now accepted by the Catholic Church and by most mainline Protestant denominations. The doctrine moved. The evidence never did.
That asymmetry is worth sitting with. In every resolved conflict between a scientific finding and a scriptural interpretation, it was the interpretation that eventually gave way. There’s no case running the other direction, where scientists ultimately conceded that the sun does circle the earth after all.
What Would We Expect to See?
If a religion’s claims about the world came from a source that actually knew how the world works, we’d expect its teachings to be ahead of human discovery, or at least not repeatedly behind it. Its institutions would have no reason to fear open investigation, because investigation would keep confirming the teachings.
If instead a religion’s claims reflect the best guesses of the era that produced its texts, we’d expect exactly the historical record we have: teachings that match ancient cosmology, friction whenever new evidence contradicts an old reading, resistance followed by slow reinterpretation, and the strongest lingering opposition in the communities most committed to the original text. That’s the pattern the documented cases show.
None of this means religious people are anti-science; millions of working scientists are believers, and religious institutions helped build the very universities where the discoveries happened. It means something narrower and harder to explain away: whenever the evidence and the doctrine disagreed, the evidence turned out to be right. You can check every case above yourself, and you should.
Want to Go Deeper?
- The Galileo affair: the full history, including the 1992 acknowledgment
- The Scopes trial of 1925: evolution in an American courtroom
- Rejection of evolution by religious groups: the ongoing story, tradition by tradition
- The conflict thesis: why historians rejected the “eternal war” version of this history
- Ronald Numbers (ed.), Galileo Goes to Jail and Other Myths About Science and Religion: a historian’s myth-busting look at both sides’ exaggerations
This page is part of The Whole Case. For how the argument fits together from the beginning, read the case from start to finish, and for what the data says about belief and knowledge, see the more we know, the less we need gods.