Largest denominational families in U.S., 1990 (self-identification, NSRI) Religious Denomination Estimated Adult Pop. Estimated % of Adult Pop. Catholic 46,004,000 26.2% Baptist 33,964,000 19.4% Methodist 14,116,000 8.0% Lutheran 9,110,000 5.2% Presbyterian 4,985,000 2.8% Jewish 3,137,000 1.8%... Sign in to see full entry.