Reddit reviews The Impossibility of God

The God Debates: A 21st Century Guide for Atheists and Believers

http://www.amazon.com/God-Debates-Atheists-Believers-Everyone/dp/1444336428

Actually, this is a great book for both of you.

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If he's hard into philosophy:

The Miracle of Theism: Arguments For and Against the Existence of God by J. L. Mackie
http://www.amazon.com/Miracle-Theism-Arguments-Against-Existence/dp/019824682X/ref=sr_1_4?s=books&ie=UTF8&qid=1302906893&sr=1-4Mackie

The Impossibility of God / The Improbablity of God by Micheal Martin (and others)
http://www.amazon.com/Impossibility-God-Michael-Martin/dp/1591021200/ref=pd_sim_b_25
http://www.amazon.com/Improbability-God-Michael-Martin/dp/1591023815/ref=pd_bxgy_b_img_b

The Six Ways of Atheism: New Logical Disproofs of the Existence of God
http://www.amazon.com/Six-Ways-Atheism-Disproofs-Existence/dp/0954395662/ref=sr_1_1?ie=UTF8&s=books&qid=1302907259&sr=1-1

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Found this on circlebroke2, and I thought I'd help.

Here That pretty much murders the O^3 version many people believe in.

I would also recommend Michael Martin as well.

Impossibility of God

Atheism: A Philosophical Justification

Why I became an Atheist

The Impossibility of God

Why God does not exist:

http://www.amazon.com/Non-Existence-God-Nicholas-Everitt/dp/0415301076

http://www.amazon.com/God-Failed-Hypothesis-Science-Shows/dp/1591026520/

http://www.amazon.com/Impossibility-God-Michael-Martin/dp/1591021200/

http://www.amazon.com/Improbability-God-Michael-Martin/dp/1591023815/

http://www.thesixwaysofatheism.com/