God is not just a hypothesis for the religiously devoted. He is a Living Reality who permeates every aspect of their lives. Religious experiences sometimes convey such a heightened sense of reality that the conviction they instill transforms the lives of the experients. Furthermore, religious experiences are often world-transforming as welljust contemplate the immense impact of people like Moses, St Paul, Augustine, William Wilberforce, and their ilk on Western civilization. But are these religious experiences trustworthy?