"Polls in recent years have shown a clear shift in religious considerations. The vast majority of Americans at this point, said Mr. Green, care less about sectarian affiliation, at least among members of faiths that are now perceived to be part of the American mainstream — Protestants, Catholics and most recently Jews — and more generally about whether the candidate believes in God and how that lends itself to a moral framework.The article itself doesn't say anything else about atheism, but this graph is appalling enough.
A national telephone survey released earlier this year by the Pew Research Center asked which traits, including being black, a woman, a Mormon, a Muslim, or a homosexual, would help or hurt a candidate the most. The worst trait for a candidate to possess? “Doesn’t believe in God.”
The New York Times, July 22, 2007