How did Enlightenment ideas influence Edward Gibbon’s writing about history and religion?

The Enlightenment profoundly shaped Edward Gibbon’s approach to history, infusing his work with the era's characteristic wit, skepticism, and rationalism. As a historian, Gibbon synthesized 17th-century erudition with 18th-century philosophy, viewing the Roman Empire through a lens of secular analysis rather than divine providence.1

Regarding religion, Gibbon’s Enlightenment perspective led him to treat faith as a phenomenon of human experience rather than a matter of spiritual truth. His skeptical stance is famously captured in his observation that to the philosopher, all religions are equally false, while to the magistrate, they are equally useful. This approach, particularly his ironic treatment of the rise of Christianity in the 15th and 16th chapters of The Decline and Fall of the Roman Empire, sparked significant controversy among his contemporaries.21

Furthermore, Gibbon’s historical narrative was driven by a commitment to intellectual and political freedom—ideals he championed as a mid-18th-century "philosopher". He interpreted the fall of Rome as a "triumph of barbarism and religion," framing the decline as a retrogression from the intellectual liberty he admired in classical literature.23