“"I guess it's true what they say. There are no straight men in the trenches."
"That's atheists, jackass. There are no atheists in the trenches."”

Source: A Farewell to Arms (1929), Ch. 2

On election night, November 4, 1980, in a call to his supporters to protest the election results after a controversial loss to his opponent, Carlos Romero Barceló by 3,503 votes. http://www.time.com/time/magazine/article/0,9171,922256-1,00.html

Source: Kilroy Was Here (1996), p. 144

"Heil und Heilung - Theologie und Psychoanalyse," speech at a conference of therapists in Basel, Switzerland (1977-05-21)

MURRAY v. CURLETT, Petition for Relief, 1959

Free Inquiry (Spring 1982) <!-- p. 9 -->
General sources
Context: I am an atheist, out and out. It took me a long time to say it. I've been an atheist for years and years, but somehow I felt it was intellectually unrespectable to say one was an atheist, because it assumed knowledge that one didn't have. Somehow, it was better to say one was a humanist or an agnostic. I finally decided that I'm a creature of emotion as well as of reason. Emotionally, I am an atheist. I don't have the evidence to prove that God doesn't exist, but I so strongly suspect he doesn't that I don't want to waste my time.

Interview with Bill Maher (2013) http://www.liveleak.com/view?i=d2b_1382908273

The Philosophy of Paine (1925)
Context: He has been called an atheist, but atheist he was not. Paine believed in a supreme intelligence, as representing the idea which other men often express by the name of deity.
His Bible was the open face of nature, the broad skies, the green hills. He disbelieved the ancient myths and miracles taught by established creeds. But the attacks on those creeds — or on persons devoted to them — have served to darken his memory, casting a shadow across the closing years of his life.
When Theodore Roosevelt termed Tom Paine a "dirty little atheist" he surely spoke from lack of understanding. It was a stricture, an inaccurate charge of the sort that has dimmed the greatness of this eminent American. But the true measure of his stature will yet be appreciated. The torch which he handed on will not be extinguished.

Source: Goodbye to All That (1929), Ch.16 On being in the trenches in France in 1915.
Context: Having now been in the trenches for five months, I had passed my prime. For the first three weeks, an officer was of little use in the front line... Between three weeks and four weeks he was at his best, unless he happened to have any particular bad shock or sequence of shocks. Then his usefulness gradually declined as neurasthenia developed. At six months he was still more or less all right; but by nine or ten months, unless he had been given a few weeks' rest on a technical course, or in hospital, he usually became a drag on the other company officers. After a year or fifteen months he was often worse than useless.