Friendly Atheist asks what books played a role in his readers thoughts about religion. In that vein, though I remain a theist, I figured I'd post a few books that were significant in my journey.
Rescuing the Bible from Fundamentalism by John Spong, gave me permission to have doubts and rethink things about my faith without feeling that I needed to leave the church. Even if one cringes at his thought, many folks have stayed in the church because of him.
Robert Funk taught me to value historicism in his book Honest to Jesus while Mortimer Adler in his book How To Think About God impressed on me that a God that is not an actuality and a faith that doesn't point to realities in this world could not suffice.
Mordechai Kaplan's The Meaning of God in Modern Jewish Religion and Gordon Kaufman's In the Face of Mystery spoke to me about God as those realities in the world that act to transform life for the better. Boenhoffer's Prison Letters taught me to locate God in this life.
Shailer Matthews' The Growth of the Idea of God and Victor Anderson's Pragmatic Theology argues that religious language and practices are responding to our experiences of the world thus providing a basis for public inquiry and discussion of religious ideas.
Gustafson's Ethics from a Theocentric Perspective, Josiah Royce's The Problem of Christianity, H. Richard Neibuhr's Radical Monotheism and Western Culture made an impact on me in helping to publicly translate religious ideas to tackle human problems.
Edgar Brightman's The Problem of God and William Ernest Hocking's The Meaning of God in Human Experience suggests the way that we can find rootedness in the particularities of our traditions while at the same time respecting the universal impulse in religion.
Which is to say that faith ought to push us to a more expansive vision of the world in a way which relativizes our own sense of things. And yet the platform it has to do this is all the particular rituals, practices and ideas of our respective traditions.
Rosemary Reuther's Christology and Cultural Criticism problematized Gnosticism. John Dewey's Common Faith broadened my sense of religious experience. Ok this list is getting too long and too many key folks are left out so what's on your book list?