Fiery writer Christopher Hitchens landed at the top of the NYT bestsellers list with his excoriating 2007 screed "God Is Not Great."(Photo by Amanda Edwards/Getty Images)
Ernest Hemingway
Though there is reason to dispute his actual status as an atheist or agnostic, Ernest Hemingway's novel "For Whom the Bell Tolls" includes a line often cited by atheists: "All thinking men are atheists."(Photo by AFP/Getty Images)
Arthur Miller
Playwright Arthur Miller said his desire to be religious "just vanished." One of his most famous plays, "The Crucible," can be read as an attack on the unquestioned power of organized religion. (Photo by Neshan H. Naltchay/AFP/Getty Images)
Luis Bunuel
Legendary director and satirist Luis Bunuel seemed to make his career out of offending the church. His Palme d'Or winner "Viridiana" mocked the Last Supper, and he was quoted as saying, tongue planted in cheek, "Thank God I'm an atheist." (Photo by AFP/Getty Images)
Julia Sweeney
Former "Saturday Night Live" cast member Julia Sweeney wrote a book about her experience as an atheist called "Letting Go of God." (Photo by Kevin Winter/Getty Images)
Adam Carolla
"Loveline" host Adam Carolla often talks about his atheism. (Photo by Timothy Norris/Getty Images)
Richard Dawkins
Daniel Radcliffe said he also respects people like author Richard Richard Dawkins, an evolutionary biologist, has written sharp criticism of the theories of creationism and intelligent design.(Photo by Mark Renders/Getty Images)
Salman Rushdie
Salman Rushdie landed in hot water when his "The Satanic Verses" was published. A fatwa was even called on him by Ayatollah Khomeini. A recent interview has revealed him as an atheist. (Photo by Jason Kempin/Getty Images)
Omar Sharif
Oscar-nominated actor Omar Sharif has, in his life, moved from Catholicism to Islam to atheism. (Photo by Gareth Cattermole/Getty Images)
Daniel Radcliffe
The "Harry Potter" franchise has already garnered the ire of some Christian groups, and recently star Daniel Radcliffe told Telegraph that he is an atheist, but is "very relaxed about it." (Photo by Andrew H. Walker/Getty Images)
Guy Pearce
In an interview with the L.A. Times, actor Guy Pearce said he doesn't believe in god and also said he enjoys wearing a shirt that reads: "Jesu$ Saves." (Photo by Andy Kropa/Getty Images)
Mark Zuckerberg
Facebook founder Mark Zuckerberg listed, on his Facebook profile, "Atheist" under "Religious Beliefs." (Photo by Gabriel Bouys/AFP/Getty Images)
Jack Nicholson
Jack Nicholson espoused his lack of belief in God in an interview with Vanity Fair in the early 1990s. Photo by Frazer Harrison/Getty Images)
Julianne Moore
Julianne Moore, like a few actors answering "Inside the Actors Studio" host James Lipton's question about what they'd say to God when they arrive at Heaven's gate, quipped, "I was wrong, you do exist!" At one point, Lipton used the line himself. (Photo by Bryan Bedder/Getty Images)
Larry King
Larry King was asked by Barbara Walters if he believed in God and his answer was, simply, "No." (Photo by Michael Buckner/Getty Images)
Brad Pitt
In interviews, Brad Pitt has called himself "probably 20 percent atheist and 80 percent agnostic." Which places him 100 percent in this slideshow. (Photo by Kevin Winter/Getty Images)
Bill Gates
Microsoft chairman Bill Gates has indicated agnosticism when he said he doesn't know if there is a god, but he added, "I think religious principles are quite valid." (Photo by Vito Amati/Getty Images)
Sarah Silverman
Sarah Silverman has said she is only Jewish culturally speaking. She said, "I have no religion." (Photo by Matt Carr/Getty Images)
Bill Maher
Bill Maher is an outspoken atheist. So much so, in fact, he worked with "Borat" director Larry Charles to make the documentary "Religulous," which attacks organized religion. (Photo by Michael Caulfield/Getty Images)
Lance Armstrong
Lance Armstrong. (Photo by Mario Tama/Getty Images)
Joaquin Phoenix
Joaquin Phoenix said he doesn't believe in god, an afterlife, or the concept of souls. "To me it's a pretty preposterous idea." (Photo by Jason Merritt/Getty Images)
George Clooney
George Clooney, in an interview with Larry King, circumvented giving a direct answer to the question of religion, but ultimately admitted, "I don't happen to have those beliefs as much. (Photo by Vittorio Zunino Celotto/Getty Images)
