Not specifically atheist, but Carl Sagan's, "The Demon Haunted World: Science as a Candle in the Dark" is a classic on general skepticism with regard to supernatural claims.
Daniel Dennett's "Breaking the Spell: Religion as a Natural Phenomenon" is quite good.
Guy P. Harrison - "50 Reasons People Give for Believing in a God".
Victor Stenger - "God the Failed Hypothesis"
Dan Barker - "Godless: How an Evangelical Preacher Became One of America's Leading Atheists"
Christopher Hitchens, Richard Dawkins, Sam Harris also have good books.
Daniel Dennett's "Breaking the Spell: Religion as a Natural Phenomenon" is quite good.
Guy P. Harrison - "50 Reasons People Give for Believing in a God".
Victor Stenger - "God the Failed Hypothesis"
Dan Barker - "Godless: How an Evangelical Preacher Became One of America's Leading Atheists"
Christopher Hitchens, Richard Dawkins, Sam Harris also have good books.
You'd believe if you just opened your heart" is a terrible argument for religion. It's basically saying, "If you bias yourself enough, you can convince yourself that this is true." If religion were true, people wouldn't need faith to believe it -- it would be supported by good evidence.
