As it begins its 118th session, the U.S. Congress remains largely untouched by two trends that have long marked religious life in the United States: a decades-long decline in the share of Americans who identify as Christian, and a corresponding increase in the percentage who say they have no religious affiliation.

Since 2007, the share of Christians in the general population has dropped from 78% to its present level of 63%. Nearly three-in-ten U.S. adults now say they are religiously unaffiliated, describing themselves as atheist, agnostic or “nothing in particular,” up from 16% who did not identify with a religion 16 years ago. But Christians make up 88% of the voting members of the new 118th Congress being sworn in on Jan. 3 – only a few percentage points lower than the Christian share of Congress in the late 1970s. In the 96th Congress, which was in session in 1979-1980, 91% of members of Congress identified as Christian.

Just like in recent sessions, only one member of the new Congress – Sen. Kyrsten Sinema, independent of Arizona – identifies as religiously unaffiliated. Another (Democratic Rep. Jared Huffman of California)