Contemporary social research often has located religion’s public influence by focusing on individual or collective religious actors. In this unitary actor model, religion is a stable, uniform feature of an individual or collectivity. However, recent research shows that people’s religious expression outside religious congregations varies by context. Building on this new work, along with insights from Erving Goffman and cultural sociology, an alternative, “cultural-interactionist model” of religious expression focuses on how group styles enable and constrain religious expression in public settings. Illustrating the model are two ethnographic cases, a religiously sponsored homeless advocacy organization and a secondary comparison setting from an activist campaign for housing, both from a U.S. metropolitan area. Shifting from actors to settings and group styles clarifies the interplay between religious and nonreligious culture over time. The shift refines our understanding of how religion’s civic or political effects work, as in the case of building social capital for collective action. The cultural-interactionist model enables us to track historical change in everyday group settings. It promotes further research on historically changing ways of managing religious diversity, and diverse ways of constructing a religious self.