A comprehensive review of 63 scientific studies conducted since 1928 found that 53 showed a reliable negative relationship between intelligence and religiosity. 35 of these studies indicated significant negative correlations, meaning higher intelligence linked consistently with lower religious belief. Only 2 studies showed meaningful positive correlations in the opposite direction.
Researchers measured the ability to reason, plan, solve problems, think abstractly, comprehend complex ideas, learn quickly, and learn from experience. Religiosity included participation in worship activities ranging from passive attendance to active devotion. The pattern held across different populations, educational levels, and age groups, though the association weakened slightly among teenagers.
Research begun in 1928 tracked 1,500 gifted children with IQs over 135 throughout their entire lives. Even in extreme old age, these highly intelligent individuals maintained their non-religious or naturalistic worldviews throughout. This lifelong pattern suggests that intelligence influences religious belief formation early and the effect persists despite life circumstances or proximity to death.
Researcher Miron Zuckerman proposed several explanations. Intelligent people typically spend more time pursuing higher education, which exposes them to diverse perspectives and scientific thinking. Better employment opportunities give them greater personal control over life direction, reducing reliance on external divine guidance.
Self-regulation developed through extended education may yield long-term benefits that religious frameworks traditionally provided. Critics note that this research remains controversial and that correlation does not always prove causation. Intelligent individuals may simply express atheism more openly rather than experiencing genuinely different beliefs. Cultural context, education access, and social pressure all influence both intelligence measures and religious expression in complex ways.
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