Via Pew Research:
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When the new, 114th Congress is sworn in on Jan. 6, 2015, Republicans will control both chambers of the legislative body for the first time since the 109th Congress (2005-2006). Yet, despite the sea change in party control, there is relatively little change in the overall religious makeup of Congress, according to a new study by the Pew Research Center. More than nine-in-ten members of the House and Senate (92%) are Christian, and about 57% are Protestant, roughly the same as in the 113th Congress (90% and 56%, respectively).1About three-in-ten members (31%) are Catholic, the same as in the previous Congress.
Protestants and Catholics continue to make up a greater percentage of the members of Congress than of all U.S. adults. Pew Research surveys find that, as of 2013, 49% of American adults are Protestant, and 22% are Catholic.
As was the case in the 113th Congress, the biggest difference between Congress and the general public is in the share of those who say they are religiously unaffiliated.