The philosopher of religion and critic of idealism, Ludwig Feuerbach had a far-reaching impact on German radicalism around the time of the Revolution of 1848. This intellectual history explores how Feuerbach’s critique of religion served as a rallying point for radicals, and how they paradoxically sought to create a new, post-religious form of religiosity as part of the revolutionary aim. At issue for the Feuerbachian radicals was the emergence of a humanity emancipated from the constraints of mere institutions, able to express itself freely and harmoniously. Caldwell also touches on Moses Hess, Louise Dittmar, and Richard Wagner in his discussion of the time. This book reconstructs the nature of Feuerbach’s radicalism and shows how it influenced early works of socialism, feminism, and musical modernism.