Pope Leo XIV has issued a sweeping indictment of artificial intelligence, arguing that the rush to develop and deploy AI systems threatens to concentrate power, erode truth, and reduce humans to mere data. The warning comes in his first encyclical, Magnifica Humanitas ("Magnificent Humanity"), released Monday and signed May 15, 2026, at St. Peter's Basilica.
The 43,000-word document positions the Vatican as a major voice in the global technology ethics debate. It arrives exactly 135 years after Pope Leo XIII's Rerum Novarum, the 1891 encyclical that shaped modern Catholic social teaching during the Industrial Revolution, suggesting the church views AI development as a defining challenge of this era.
The pope's central argument is that AI is not neutral. Systems carry the values, biases, and interests of those who build, finance, train, and deploy them. This becomes especially consequential when AI decides who receives jobs, credit, public services, or social standing.
Leo identifies five major harms. First, AI can erode human judgment by supplying instant answers that undermine creativity, discernment, and the patient search for truth. Second, it can simulate empathy and care in ways that trick vulnerable people into mistaking artificial responses for genuine human connection. Third, AI deepens inequality because the resources needed to build and control these systems, including data and computing power, remain concentrated among a small number of actors and institutions.
Fourth, he warns that AI destabilizes democracy by amplifying disinformation and blurring the boundary between fact and fiction. Fifth, and perhaps most starkly, Leo argues that AI accelerates warfare by speeding lethal decisions and creating distance between humans and the consequences of those decisions. "No algorithm can make war morally acceptable," he writes.
The encyclical compares the AI moment to the biblical Tower of Babel, a project of human ambition that dazzled but ultimately fragmented and confused humanity.
Meghan Sullivan, director of Notre Dame's Institute for Ethics and the Common Good, told Axios that Leo has established himself as a leading figure in AI ethics with this document. Sullivan predicted it will rank among the major documents in Catholic history.
University of St. Thomas philosophy professor Mirela Oliva framed the encyclical not as a rejection of AI but as a call to shape the coming "AI era" around human dignity. Oliva noted that Leo is calling for new AI guidelines developed from the bottom up rather than imposed from above.
The practical reach of the encyclical may depend on whether Leo's language influences regulatory debates beyond Catholic circles. Sacred Heart University professor Dan Rober suggested the pope's warnings about children, screen time, AI platforms, and people using chatbots as therapists or substitutes for friendship could resonate far more widely. If Leo's framing enters mainstream policy conversations, the encyclical could reshape how governments and companies approach AI development and deployment.
Author James Rodriguez: "The pope has essentially weaponized Catholic moral authority against tech industry cheerleading, and that's a calculation Silicon Valley did not expect."
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