Atheism is somewhat difficult to define. Wikipedia has the following "in a broad sense, the rejection of belief in the existence of deities. In a narrower sense, atheism is specifically the position that there are no deities. Most inclusively, atheism is the absence of belief that any deities exist."

Waking Up: A Guide to Spirituality Without Religion
The Skeptics' Guide to the Universe: How to Know What's Really Real in a World Increasingly Full of Fake
Undeniable: Evolution and the Science of Creation
Seven Types of Atheism
Finding Truth: 5 Principles for Unmasking Atheism, Secularism, and Other God Substitutes
God: The Most Unpleasant Character in All Fiction
Your God Is Too Small: 50 Essays On Life, Love & Liberty Without Religion
Something Other than God: How I Passionately Sought Happiness and Accidentally Found It
The Reason Revolution: Atheism, Secular Humanism, and the Collapse of Religion
Life Driven Purpose: How an Atheist Finds Meaning
Battling the Gods: Atheism in the Ancient World
The Story of God: A Biblical Comedy about Love [and Hate]
Agnostic: A Spirited Manifesto
How Jesus Became God: The Exaltation of a Jewish Preacher from Galilee
Village Atheists: How America's Unbelievers Made Their Way in a Godly Nation
The God Delusion
God Is Not Great: How Religion Poisons Everything
The End of Faith: Religion, Terror, and the Future of Reason
Letter to a Christian Nation
The Portable Atheist: Essential Readings for the Nonbeliever
Breaking the Spell: Religion as a Natural Phenomenon
Why I Am Not a Christian and Other Essays on Religion and Related Subjects
Godless: How an Evangelical Preacher Became One of America's Leading Atheists
God: The Failed Hypothesis: How Science Shows That God Does Not Exist
The Demon-Haunted World: Science as a Candle in the Dark
Atheist Universe: The Thinking Person's Answer to Christian Fundamentalism
The Moral Landscape: How Science Can Determine Human Values
Atheism: The Case Against God
The Greatest Show on Earth: The Evidence for Evolution
God, No! Signs You May Already Be an Atheist and Other Magical Tales
Misquoting Jesus by Bart D. EhrmanJesus, Interrupted by Bart D. EhrmanA History of God by Karen ArmstrongWho Wrote the Bible? by Richard Elliott FriedmanThe Gnostic Gospels by Elaine Pagels
Understanding the Bible
269 books — 228 voters
The God Delusion by Richard DawkinsGod Is Not Great by Christopher HitchensThe Demon-Haunted World by Carl SaganThe End of Faith by Sam HarrisThe Portable Atheist by Christopher Hitchens
What is Atheism About?
69 books — 84 voters

Freethinkers by Susan JacobyThe Great Agnostic by Susan JacobyWhat's God Got to Do with it? Robert Ingersoll on Free Though... by Robert G. IngersollDoubt by Jennifer Michael HechtLectures of Col. R. G. Ingersoll, Vol. I by Robert G. Ingersoll
Freethought History
59 books — 13 voters
The Atheist Muslim by Ali A. RizviInfidel by Ayaan Hirsi AliRage Against the Veil by Parvin DarabiThe Trouble With Islam Today by Irshad ManjiThe Tragedy of Islam by Imam Mohammad Tawhidi
Ex-Muslim reading list
25 books — 9 voters

Agnosticism by Robin Le Poidevin
1 book — 1 voter
Brave New World by Aldous HuxleyThe Dispossessed by Ursula K. Le GuinA People's History of the United States by Howard Zinn1984 by George OrwellBury My Heart at Wounded Knee by Dee Brown
Propagandhi's Reading List
72 books — 3 voters

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Douglas Adams
Isn't it enough to see that a garden is beautiful without having to believe that there are fairies at the bottom of it too?
Douglas Adams, The Hitchhiker's Guide to the Galaxy

Ernest Hemingway
All thinking men are atheists.
Ernest Hemingway, A Farewell to Arms

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The Scripture
1 chapters — updated Sep 13, 2013 06:10AM — 0 people liked it
Which Ones Are Scientific by George Grebens
1 chapters — updated Jul 03, 2009 10:29AM — 0 people liked it