The Great Agnostic: Robert Ingersoll and American Freethought

Susan Jacoby's biographical study examines Robert Ingersoll's central role in shaping American freethought during the late nineteenth century, arguing that his particular brand of agnosticism represented a distinctive intellectual and cultural force that challenged both religious orthodoxy and dogmatic atheism. The work positions Ingersoll as a pivotal figure who articulated a form of epistemic humility that rejected supernatural claims while maintaining openness to the limits of human knowledge.

Jacoby employs a historical-biographical methodology that situates Ingersoll within the broader context of post-Civil War America's intellectual ferment. She traces how Ingersoll's legal training and oratorical skills enabled him to translate philosophical skepticism into popular discourse, reaching audiences that academic freethinkers could not. The study demonstrates how Ingersoll's agnosticism emerged from engagement with scientific naturalism, particularly Darwinian evolution, while avoiding the militant atheism that characterized some contemporary European thought.

The work engages scientific naturalism by showing how Ingersoll used advances in geology, biology, and astronomy to challenge biblical literalism and religious cosmology. Rather than simply rejecting religious claims, Jacoby illustrates how Ingersoll developed sophisticated arguments about the sufficiency of natural explanations for phenomena previously attributed to divine action. His approach emphasized empirical evidence and rational inquiry while acknowledging the provisional nature of scientific knowledge.

Central to Jacoby's analysis is Ingersoll's deployment of epistemic humility arguments. She demonstrates how he distinguished between claiming certainty about God's non-existence and maintaining reasoned doubt about supernatural claims. This position allowed Ingersoll to critique religious dogmatism without embracing an equally dogmatic atheism. Jacoby shows how this stance proved particularly effective in the American context, where outright atheism remained culturally unacceptable.

The monograph's contribution to contemporary debates about God lies in its recovery of a historically significant but often overlooked position in American religious discourse. Jacoby argues that Ingersoll's agnosticism offered a model for public skepticism that was both intellectually rigorous and culturally engaged. By examining how Ingersoll navigated between belief and disbelief, the work illuminates tensions that continue to characterize discussions about religious knowledge and secular values in American public life.