Can emphasis on shared religion reduce out-group prejudice? To explore this question, we conducted a survey experiment on the effect of religious primes on Turkish citizens’ attitudes and behavior toward Syrian refugees in Istanbul and Gaziantep. We used a factorial design to compare the independent and interactive effects of primes emphasizing refugees’ Sunni or Muslim identity and a factual statement on the economic cost of the refugees. We find that religious primes increase respondents’ level of donations to a charity supporting Syrian refugees and certain attitudinal measures of support for the refugees. We also uncovered a differential impact among the Sunni and Muslim primes and found that the statement of economic cost removed the pro-refugee effect of religious primes.