The idea of "world religions" expresses a vague commitment to multiculturalism. Not merely a descriptive concept, "world religions" is actually a particular ethos, a pluralist ideology, a logic of classification, and a form of knowledge that has shaped the study of religion and infiltrated ordinary language. In this ambitious study, Tomoko Masuzawa examines the emergence of "world religions" in modern European thought. Devoting particular attention to the relation between the comparative study of language and the nascent science of religion, she demonstrates how new classifications of language and race caused Buddhism and Islam to gain special significance, as these religions came to be seen in opposing terms-Aryan on one hand and Semitic on the other. Masuzawa also explores the complex relation of "world religions" to Protestant theology, from the hierarchical ordering of religions typical of the Christian supremacists of the nineteenth century to the aspirations of early twentieth-century theologian Ernst Troeltsch, who embraced the pluralist logic of "world religions" and by so doing sought to reclaim the universalist destiny of European modernity.