In this paper I explore the history of the notion that to believe in religion is to believe in society by tracing instances in which, in the discourse of this current within nineteenth-century French republicanism, the term religion entered into the same semantic field as the notions of society and association. I analyze several groups and individuals who sought to define religion by invoking "association" and "society": the Saint-Simonians, P.-J.-B. Buchez, Pierre Leroux, Jean-Marie Guyau, and Emile Durkheim. I conclude by suggesting that this way of thinking about religion not only illuminates the intellectual context in which Durkheim's religious sociology emerged, but also highlights a distinctly French social imaginary.