Individual religiosity is often discussed and at times found to be associated with anti-pluralistic attitudes and outgroup hostility, such as nativism. Yet, less is known about contextual factors like the strength and visibility of actors that instrumentalize religion to reinforce nativist sentiments. The most prominent actors in that regard are populist radical right parties (PRRPs) that politicize Christianity to promote their right-wing stances. I seek to address this gap by assessing whether PRRPs’ participation in government influences the impact of individual religiosity on nativism. I argue, first, that more religious Christians are likely to have a stronger tendency toward nativism and expect, second, that governing PRRPs reinforce this impact. The study analyzes 37 European and Latin American countries using data from the Joint EVS/WVS (2017–22). Results show that religiosity is indeed related to nativism. However, there is no evidence that PRRPs in power strengthen this religiosity–nativism nexus.