There is only one member of Congress who is on record as NOT holding a god-belief... Representative Pete Stark (D) of California has acknowledged that he is an atheist in response to the Secular Coalition’s inquiry.
Pete Stark (76 this year) was first elected as a Democrat to Congress in 1972 from Fremont-Anaheim, Califiornia. He's a senior member of the House Ways and Means Commitee and is the Chair of the Health Commitee.
He showed up as a blip on my A-dar, but only 'cuz I'm familiar with his reputation as a liberal firebrand who was outspoken regarding Bush's "Faith-Based" scammery - AND he has been listed as "affiliated" as a Unitarianist. Unitarianist may or may not claim belief in a deity.
He was on-the-record speaking out and voting against the Chimperor-in-Chief's Iraq war proposal:
"Congress must not walk in lockstep behind a president who has been so callous to proceed without reservation, as if war was of no real consequence..."
Every year, American Atheists state director Dave Kong presents awards to the California members and others who helped to further the cause of state/church separation. In 2002, U.S. Congressmen Mike Honda and Pete Stark were honored with the First Amendment award for their courageous refusal to endorse the resolution condemning the Pledge decision issued by the Ninth Circuit Court of Appeals in June (the court ruled that the insertion of "God" into the Pledge of Allegiance was unconstitutional)."
Stark and another congressman released a report in July of last year that shows "the Bush administration has sent billions of taxpayer dollars to religious organizations without accountability for how that money is spent," said Stark, the senior Democrat on the House Ways and Means Health Subcommittee.
"The Bush administration has failed to develop standards to verify that faith-based organizations aren't using federal funds to pay for inherently religious activity or to provide services on the basis of religion. Taxpayers shouldn't have to take it on faith that programs without standards for success are having a measurable impact."
Pete Stark is a peace advocate. He also supports increasing the availability of health care, revitalizing the economy, and protecting the environment.
This is a START! Surveys vary in the percentage of atheists, humanists, freethinkers and other nontheists in the U.S, with about 10% (30 million people) a fair middle point. “If the number of nontheists in Congress reflected the percentage of nontheists in the population,” Lori Lipman Brown, director of the Secular Coalition, observes, “there would be 53-54 nontheistic Congress members instead of one.”