How do Christian interfaith practitioners live out their discipleship in a multi-faith world? And what, theologically, is being expressed in their activity? Demonstrating a new and innovative approach to interfaith engagement, this book argues for theological reflection on the multi faith reality of our society to focus on the practice of Christian interfaith engagement, drawing on the tools of contemporary practical theology. The book draws on contemporary models of research in practical theology, such as auto ethnography, qualitative interviewing and analysis of spiritual journaling, to explore grassroots Christian engagement with other faiths and its impact upon Christian self-understanding.