When it comes to religious affiliation, the 117th U.S. Congress looks similar to the previous Congress but quite different from Americans overall.

While about a quarter (26%) of U.S. adults are religiously unaffiliated – describing themselves as atheist, agnostic or “nothing in particular” – just one member of the new Congress (Sen. Kyrsten Sinema, D-Ariz.) identifies as religiously unaffiliated (0.2%).

Nearly nine-in-ten members of Congress identify as Christian (88%), compared with two-thirds of the general public (65%). Congress is both more heavily Protestant (55% vs. 43%) and more heavily Catholic (30% vs. 20%) than the U.S. adult population overall.

Members of Congress also are older, on average, than U.S. adults overall. At the start of the 116th Congress, the average representative was 57.6 years old, and the average senator was 62.9 years old.1 Pew Research Center surveys have found that adults in that age range are more likely to be Christian than the general public (74% of Americans ages 50 to 64 are Christian, compared with 65% of all Americans ages 18 and older). Still, Congress is more heavily Christian even than U.S. […]