Factual relativism forms the ocean in which all bad arguments swim…

"The quest for empirical knowledge and reason gives purpose to life. Supernaturalism, mysticism and religion take it away. The best anyone can do is to attempt to eliminate all beliefs and subjective biases." –Sean Prophet – BlackSun credo

"Anxiety is the dizziness of freedom."
  – Soren Kierkegaard

"That’s progress–when we prove things wrong." –Neil Turok

"yearning for purity, whether based in class, race or religion, is what lays at the root of all crimes against humanity." Nathan Gardels, summarizing the views of Bernard-Henri Levy

"Humor is the only test of gravity, and gravity of humor; for a subject which will not bear raillery is suspicious, and a jest which will not bear serious examination is false wit."
  – Aristotle

"It’s not enough to bash in heads. You’ve got to bash in minds."
  – Joss Whedon, Zack Whedon, Maurissa Tancharoen, and Jed Whedon

"Faith is a cop-out. If the only way you can accept an assertion is by faith, then you are conceding that it can’t be taken on its own merits."
  – Dan Barker

"Rogues are preferable to imbeciles because they sometimes take a rest."
  – Alexandre Dumas

"Man is tormented by no greater anxiety than to find someone quickly to whom he can hand over that great gift of freedom with which the ill-fated creature is born."
  – Fyodor Dostoevsky

"It is impossible to defeat an ignorant man in argument."
William G. McAdoo

"Oh, what a tangled web we weave when first we practice to believe."–Laurence J. Peter, misquoting Sir Walter Scott

"Those who can make you believe absurdities, can make you commit atrocities." –Voltaire

"Why do the faithful have such a will, to believe in something? And call in the name they choose, having chosen nothing…" —Ian Anderson, Back Door Angels, Warchild

"The truth that makes men free is for the most part the truth which men prefer not to hear." – Herbert Agar

"It has been my experience that folks who have no vices have very few virtues."
  – Abraham Lincoln 

"The problem with people who have no vices is that generally you can be pretty sure they’re going to have some pretty annoying virtues."
  – Elizabeth Taylor

"If only there were evil people somewhere insidiously committing evil deeds and it were necessary only to separate them from the rest of us and destroy them. But the line dividing good and evil cuts through the heart of every human being. And who is willing to destroy a piece of his own heart?" –Alexander Solzhenitsyn

"Truth is God." –Mohandas K. Gandhi

"Reality is that which, when you stop believing in it, doesn’t go away." –Philip K. Dick

"Science is a willingness to accept facts even when they are opposed to wishes." — B. F. Skinner

"For a successful technology, reality must take precedence over public relations, for Nature cannot be fooled." — Richard Feynman

"Religion is regarded by the common people as true, by the wise as false, and by the rulers as useful." — Seneca

"What has theology ever said that is of the smallest use to anybody? When has theology ever said anything that is demonstrably true and is not obvious? I have listened to theologians, read them, debated against them. I have never heard any of them ever say anything of the smallest use, anything that was not either platitudinously obvious or downright false. If all the achievements of scientists were wiped out tomorrow, there would be no doctors but witch doctors, no transport faster than horses, no computers, no printed books, no agriculture beyond subsistence peasant farming. If all the achievements of theologians were wiped out tomorrow, would anyone notice the smallest difference? Even the bad achievements of scientists, the bombs, and sonar-guided whaling vessels work! The achievements of theologians don’t do anything, don’t affect anything, don’t mean anything. What makes anyone think that "theology" is a subject at all?" — Richard Dawkins

"There is no god, there is no god, there is no god at all. He who invented god is a fool. He who propagates god is a scoundrel. He who worships god is a barbarian." –Periyar (E. V. Ramasami Naicker)

"Every dictator uses religion as a prop to keep himself in power." —Martyred Pakistani Prime Minister Benazir Bhutto in a 1986 television interview. Quoted by Reuters.

"Sleep is good, death is better; but of course, the best thing would be to have never been born at all."– Heinrich Heine

Anti-theist quotes from U.S. Presidents:

"What havoc has been made of books through every century of the Christian era? Where are fifty gospels condemned as spurious by the bull of Pope Gelasius? Where are forty wagon-loads of Hebrew manuscripts burned in France, by order of another pope, because of suspected heresy? Remember the Index Expurgatorius, the Inquisition, the stake, the axe, the halter, and the guillotine; and, oh! horrible, the rack! This is as bad, if not worse, than a slow fire. Nor should the Lion’s Mouth be forgotten. Have you considered that system of holy lies and pious frauds that has raged and triumphed for 1,500 years." —John Adams letter to John Taylor, 1814, quoted in In God We Trust and 2000 Years of Disbelief

"The clergy believe that any power confided in me will be exerted in opposition to their schemes…and they believe rightly." –Thomas Jefferson

"I have seldom met an intelligent person whose views were not narrowed and distorted by religion." –James Buchanan

"My earlier views on the unsoundness of the Christian scheme of salvation have become clearer and stronger with advancing years." –Abraham Lincoln

"Leave the matter of religion to the family altar, the church, and the private schools, supported entirely by private contributions. Keep the church and state forever separated"– Ulysses S. Grant

"In the long run, the most unpleasant truth is a safer companion than a pleasant falsehood." — Theodore Roosevelt

"I believe in an America where the separation of Church and State is absolute."– John F. Kennedy