Prior research on the effect of religion on prejudicial attitudes against sexual minorities has looked into how religion may influence public attitudes towards homosexual behaviours, gay marriage, and same-sex adoption. However, less is known about how religion may influence employment discrimination against gays in the education industry where prejudice and discrimination against gays frequently occur. Using the 1993-2018 cumulative General Social Survey data merged with county and state-level demographic and religious data of the United States, this study finds that individuals are more likely to favour banning homosexual men from teaching in college when county-level evangelical Protestant homogeneity increases. By contrast, when a county has a higher concentration of Catholics, individuals are less likely to endorse such discriminatory action, regardless of their own individual religious affiliation. This study contributes to a growing trend of research examining religious moral communities beyond its most general form -- the overall church membership rates. Instead, as the results suggest, religious moral communities are multi-dimensional and the extent to which a religion dominates a geographic area may have a broad social impact on the whole community.