A few patterns to note:
- The number of Protestants has dropped dramatically – roughly a loss of 100 from sixty years ago – even as the percent of Protestants in Congress (54%) continues to be higher than the percent of Protestants in the U.S. population (48%).
- The number of Catholics in Congress increased from the 1960s into the late 1970s and early 1980s and then has stayed relatively stable. There are more Catholics in Congress (30%) than in the U.S. population as a whole (21%).
- The number of religious others is still low and hasn’t changed much over time.
- As noted in the summary of the findings:
But by far the largest difference between the U.S. public and Congress is in the share 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 – Sen. Kyrsten Sinema, D-Ariz., who was recently elected to the Senate after three terms in the House – says she is religiously unaffiliated, making the share of “nones” in Congress 0.2%.
When asked about their religious affiliation, a growing number of members of Congress decline to specify (categorized as “don’t know/refused”). This group – all Democrats – numbers 18, or 3% of Congress, up from 10 members (2%) in the 115th Congress. Their reasons for this decision may vary. But one member in this category, Rep. Jared Huffman, D-Calif., announced in 2017 that he identifies as a humanist and says he is not sure God exists. Huffman remains categorized as “don’t know/refused” because he declined to state his religious identity in the CQ Roll Call questionnaire used to collect data for this report.3
In summary, Congress is overwhelmingly religious and Christian. While America as a whole is still solidly majority religious and Christian, Congress is even more so. This seems to suggest Americans still like to elect people who have a faith affiliation even if there is less information on the actual beliefs and practices of the Representatives and Senators (this data “does not attempt to measure their religious beliefs or practices. “).