In this article, the author examines the place of religion in the common public culture of Quebec, in order to explore how the place of religiosity could be envisioned within the structure of public institutions. Drawing on sociological, religious, and legal readings, he intends to ascertain whether it is possible for public policy to make a place for religion and if so, under what condition(s). By distinguishing two possible approaches to the place of religion in public action, namely religion as a normative foundation and religion as an intervention tool, the author explores the idea that it is possible to include religion in public action, provided that it is not considered a foundational norm of the latter, but rather one of many intervention tools intended to serve public policy. In this article, the author therefore suggests a nuanced reading of the issues of cultural and religious diversity that departs from two strong stances regarding religion in the public space : the position of strict exclusion that attempts to eliminate religion from public life ; and the position of inclusion without conditions that consists in unconditionally accepting the presence of religion within public action.