Through an examination of Christian interaction with other religions, Paul S. Chung constructs a theology of comparative religion. In the course of this construction, he employs the work of Ernst Troeltsch, Robert Bellah, and Karl Barth, while offering case studies of transformative interaction between Buddhism, Christianity, and Islam. Chung’s interdisciplinary approach opens up new avenues for inter-religious understanding and melding, for instance exploring the development of a Protestant Islam. Throughout, he provides innovative conceptions of the religions involved and the realities they assert.