Was Marx Right About Religion?: The Human Brain Has Entered the Debate
(ANALYSIS) In 1843, Karl Marx called religion “the opium of the people.” He framed faith as a cheap chemical cheat code used by the ruling class to keep peasants from running riot. Marx envisioned a future in which human beings would abandon their spiritual crutches once the material conditions of labor improved.
Neurologists spent decades looking inside the human skull to see if the bearded prophet had a point. Recent neurobiological studies confirm that communal rituals and intense prayer trigger the release of endogenous mu-opioids.
These are the body's built-in painkillers. They’re the exact same molecular compounds that generate a runner’s high or soothe physical injury. The brain manufactures its own internal painkiller during mass and religious services, using its built-in biological chemistry to decrease stress and create a deep sense of safety.
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The immediate temptation for secular commentators is to slap Marx on the back and call it a day. The brain produces opiate-like chemicals during worship. Church functions as a pharmacy. The case seems closed.
That lazy leap ignores basic biology. The human brain runs on a strictly limited menu of neurotransmitters. It uses the exact same opioid system to handle the excruciating agony of a broken femur and the warm rush of holding a newborn. In other words, the chemical delivery system tells you how the machine works, not why the driver turned the key.
Marx saw religion as a top-down sedative administered by elites to dull the pain of feudalism. History offers a different perspective. In August 1980, thousands of Polish shipyard workers in Gdańsk went on strike against a corrupt Communist regime. They knelt on the cold concrete of the factory floor to take communion and pray together while armed state militia waited outside the gates.
Their Catholic faith provided the resolve required to defy Soviet tanks. Instead of acting as a sedative that kept them compliant, their faith gave them the courage to defy totalitarian control and smash the state. My point is simple. Religious belief equips communities to stand strong and rally against tyranny.
Sadly, modern society has spent the last few decades attempting to flush that fact down the toilet. The results speak for themselves. The U.S. Surgeon General issued an official advisory on the epidemic of loneliness in 2023, while prescriptions for anti-anxiety medications hit record numbers across Western nations. People traded the Sunday morning choir for the infinite scroll, replacing a divine neurochemical trigger with a destructive one.
The brain's opioid response during prayer reveals that humans are hardwired for shared awe. Marx treated the brain as a passive bucket that absorbed ruling-class propaganda. He overlooked the reality that the human nervous system demands meaning and connection to avoid total mental breakdown. We are biological machines that require high-intensity group experiences to maintain sanity in an increasingly insane world.
Calling faith an opiate misses the entire point of the mechanism. An actual narcotic forces the user into an isolated stupor. A religious service encourages two hundred humans to sit in a room, look each other in the eye, sing in unison, and give thanks to a higher power. The neurochemistry is real. But it builds functioning towns rather than drug dens.
Marx got the metaphor upside down. Religion never served as an artificial drug injected into a healthy society to make it docile. Rather, it evolved to promote unity and to prevent fragile beings from tearing each other to pieces in the dark. You can destroy the cathedral, but the brain's receptors remain wide open, hunting desperately for the next high.
Voltaire famously remarked in 1768 that if God didn’t exist, it would be necessary to invent Him. He recognized the practical utility of the sacred long before brain imaging confirmed the neurological mechanics. The human species built civilization on the foundation of shared stories that triggered real neurochemical bonds. A society that abandons that sense of solidarity doesn’t suddenly become rational. It simply finds worse things to worship.
The Soviet Union attempted an explicit engineering project in 1922 to erase religious worship through state policy and institutional violence. They demolished churches. They executed clergy and taught mandatory scientific atheism in state schools for seven decades. The regime replaced traditional liturgies with parades for army generals and veneration of embalmed Bolshevik leaders in Red Square. The underlying neurobiology didn’t vanish under government mandate. The populace redirected its instinct for devotion toward totalitarian state bureaucracy, creating a paranoid culture of mutual surveillance and party loyalty.
Scientific literature on addiction demonstrates that human beings constantly seek escape from existential dread. Across America, 80,000 people lose their lives to drug overdoses each year, or 219 people every day. That mind-boggling metric reflects a population drowning in synthetic opioids because their social bonds are nonexistent. Real opium destroys the individual and breaks the family unit. Religious ritual links the individual to a broader network of mutual aid and communal responsibility.
Marx mistook the biological container for the content inside it. He assumed that removing the church would liberate the human mind from irrationality, leaving behind an enlightened worker ready to build a communist paradise. He was wrong.
John Mac Ghlionn is a researcher and essayist. He covers psychology and social relations. His writing has appeared in places such as UnHerd, The US Sun and The Spectator World.