European political parties, particularly radical right parties (RRPs), increasingly use religious symbols during elections. Despite the prevalence of these symbols, evidence on the association between religion and far-right vote share is mixed. We compare two leading arguments explaining the relationship between religion and RRPs. We hypothesize that the number of religious buildings, identifiable as Islamic or Catholic, will be associated with higher RRP support. We test this as a most likely crucial case using results from the French 2017 presidential election. Controlling for other demographic factors, more Catholic buildings in a commune are associated with a decrease in votes for the Front Nationale (FN). An increase in the number of mosques in non-urban communes is associated with increased support for FN. We argue these findings are evidence that RRPs use religious symbolism to draw on nativist or anti-Islamic support rather than traditional religious support.