From Wikipedia
en.wikipedia.org
"The top five religious affiliations in the 111th Congress were Roman Catholic (30.1%), Baptist (12.4%), Methodist (10.7%), Jewish (8.4%), and Presbyterian (8.1%).[3] Protestant denominations have held a large majority throughout congressional history, reflecting American’s traditional demographics. In the 111th Congress, 54.7% of seats were held by members of Protestant denominations.
45 Jews served in the 111th Congress. Eleven representatives and six senators were members of The Church of Jesus Christ of Latter-day Saints. Senator Olympia Snowe, as well as Representatives John Sarbanes, Zack Space, Gus Bilirakis, Dina Titus, Niki Tsongas and Melissa Bean are Orthodox Christians.
In 2007, Keith Ellison of Minnesota became the first practicing Muslim to become a member of the United States Congress. He was joined by André Carson of Indiana following a special election on March 11, 2008. Mazie Hirono of Hawaii and Hank Johnson of Georgia became the first two Buddhists to be elected to the United States Congress on November 7, 2006. Johnson is a member of the Soka Gakkai movement and Hirono is a member of the Jodo Shinshu sect, although she is non-practicing. Both are Japanese Buddhist oriented.
Senator Kent Conrad (D-N.D.) and Representatives Walt Minnick (D-Idaho) and Pete Stark (D-CA) were the only Unitarian Universalists that served in the 111th Congress. In a response to a March 2007 survey from the Secular Coalition for America, Rep. Pete Stark became the only open atheist in the history of Congress.[4] One member of the 111th Congress is a Quaker, Representative Rush Holt (D-NJ).
Nine members of the 111th Congress were categorized Not Given / Unspecified / Unavailable / Don’t Know.
Hawaii is the only state that currently holds a majority non-Christian House delegation; both representatives Mazie Hirono and Colleen Hanabusa are Buddhists."