The Pew survey of the new Congress finds little too surprising about the religious make-up of the new bunch, but this is still remarkable:

The greatest disparity between the religious makeup of Congress and the people it represents is in the percentage of the unaffiliated those who describe their religion as atheist, agnostic or “nothing in particular.” Only six members of the 112th Congress (about 1%) do not specify a religious affiliation and none say they are unaffiliated. By contrast, about one-sixth (16%) of U.S. adults are not affiliated with any particular faith.
This group has also been growing very strongly - but the public political culture closets it.