The new Congress is slightly more religiously diverse than its predecessor, but it remains overwhelmingly Christian, according to a new Pew Research Center analysis of congressional data collected by CQ Roll Call.

For the first day of the 116^th Congress, here are five facts about the religious affiliation of members of Congress:

1) The religious composition of the new Congress is very different from that of the U.S. adult population. While the number of self-identified Christians in Congress has ticked down slightly, Christians as a whole – and especially Protestants and Catholics – are still overrepresented in proportion to their share in the general public. But by far, the largest difference between the U.S. public and Congress is in the share of people who are unaffiliated with a religious group. In the general public, 23% say they are atheist, agnostic or “nothing in particular.” In Congress, just one person says she is religiously unaffiliated – Sen. Kyrsten Sinema, D-Ariz., who was recently elected to the Senate after three terms in the House.

2) While Congress remains overwhelmingly Christian, the number of non-Christian members has risen to 63. Most non-Christian members of Congress are Jewish (34), but there are also two Buddhists, three Muslims, three Hindus, two Unitarian Universalists, one unaffiliated member and 18 who decline to specify a religious affiliation. Only two of the non-Christians – Jewish Reps. Lee Zeldin, R-N.Y., and David Kustoff, R-Tenn. – are Republicans. The rest are Democrats.

3) The largest change in the new Congress comes in the “unspecified/other” Protestant category, which gained 16 seats. (“Unspecified/other” Protestants include those who say they are Christian, evangelical Christian, evangelical Protestant or Protestant, without specifying a denomination.) Presbyterians and Anglicans/Episcopalians lost the most seats in the new Congress, with each losing nine.

4) There are fewer Christians in the incoming freshman class than there are among incumbents. In the new Congress, 96 freshmen will join 438 incumbents: the largest freshman class since 2011, when the 112th Congress was sworn in. While the share of Christians among the freshman class is still higher than among the general public (81% vs. 71%), it is lower than the share among incumbents (90%). Among the new members are the first two Muslim women in Congress, Reps. Rashida Tlaib, D-Mich., and Ilhan Omar, D-Minn.

5) Both chambers of Congress have roughly similar shares of Christians and non-Christians. But within those categories, there are some differences, particularly with regard to Catholics, who make up 32% of the House, but just 22% of the Senate. Additionally, all of the Muslims, Hindus and Unitarian Universalists are in the House.

Source: Pew Research Center