From Wired essay by Oxford Professor Richard Dawkins on the use of the term bright to describe non-believers:
A Gallup poll in 1999 asked American voters the following question: “If your party nominated a generally well-qualified person for president who happened to be an X would you vote for that person?” X took on the following values: Catholic, Jew, Baptist, Mormon, black, homosexual, woman, atheist. Six out of the eight categories secured better than 90 percent approval. But only 59 percent would vote for a homosexual, and just 49 percent would vote for an atheist. Bear in mind that there are 29 million Americans who describe themselves as nonreligious, secular, atheist, or agnostic, outnumbering Jews tenfold and all other religions except Christianity by an even larger margin.