Galileo Galilei contributed to secularism during the Renaissance by challenging the prevailing geocentric model of the universe, which was closely tied to religious doctrine. His support for heliocentrism, based on observational evidence, encouraged a shift towards empirical science and rational thought, diminishing the authority of religious explanations. This emphasis on observation and reason helped lay the groundwork for modern scientific inquiry and promoted a worldview that valued human understanding over theological interpretations.
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