Following social identity theory, this research examines the relationship between group identification and intergroup relations by focusing on religion. Religious as well as Dutch national group identification was examined among Turkish-Dutch Muslims. Identification was studied in relation to general affective ratings of multiple religious groups (Muslims, Christians, Hindustanis, Jews and non-believers) and the endorsement of Islamic group rights. The results show that Muslim identification was more like a nominal (high or `total' identification) than a continuous variable, and that many participants showed low identification with the national group. The affective ratings of religious out-groups were quite negative, particularly of the Jew...