(From a liberal Christian netfriend):

Soul Survivor (How my faith survived the Church) – Philip Yancey

The Varieties of Religious Experience – William James

Letters and Papers From Prison – Dietrich Bonhoeffer

Fit Bodies, Fat Minds (Why Evangelicals don’t think and what to do about it) – Os Guinness

On Being A Christian – Hans Kung

A History of God – Karen Armstrong

A History of Israel – John Bright

Stages of Faith – James W Fowler

Honest to God – John T Robinson

Rescuing The Bible From Fundamentalism – John Shelby Spong

A New Christianity For A New World (Why traditional faith is dying and how a new faith is being born) – John Shelby Spong