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Other books I have read written by former preachers who are now atheists:
Godless: How an Evangelical Preacher Became One of America's Leading Atheists by Dan Barker
Hope after Faith: An Ex-Pastor's Journey from Belief to Atheism by Jerry DeWitt
With or Without God: Why the Way We Live Is More Important Than What We Believe by Gretta Vosper
Greta Vosper is a pastor in the United Church of Canada. She's a self-identified atheist, and has very left-wing ideas.
The United Chaplain at my school pointed me towards her. The chaplain said that she doesn't agree with everything Vosper says, but it offers interesting ideas.
http://www.amazon.com/With-Without-God-Important-Believe/dp/0062294857/ref=sr_1_1?ie=UTF8&qid=1398234192&sr=8-1&keywords=greta+vosper