Members of The Church of Jesus Christ of Latter-day Saints are the Christian group most likely to marry within their faith. Research suggests that married couples who attend church together are more likely to have happy and stable marriages. One study found that Latter-day Saints have the most stable marriages of any faith. 82% of Latter-day Saints are married to someone who is also a Latter-day Saint. Here are the survey question and answers: “My spouse is a member of the same church as I am.” Latter-day Saints: 82% Catholics: 75% Jewish: 65% Protestants: 59% To add to this, a recent Gallup study found that 67% of Latter-day Saints attend religious services weekly. In summary, Latter-day Saints tend to marry people who are likely to attend religious services with them weekly, resulting in an increased likelihood of a happy and stable marriage. Obviously, marriage stability and happiness are complex issues with many details, but the data here is notable. Sources: Research on spouses who attend church together: Institute for Family Studies; Four Proven Ways to A Strong And Stable Marriage Research on Latter-day Saint Marriage Stability: Religion as a Determinant of Marital Stability; Duke University Press Survey data on Spouses and Religious Affiliation: Pew Research; Mormons more likely to marry, have more children than other U.S. religious groups Weekly attendance: Gallup article titled Church Attendance Has Declined in Most U.S. Religious Groups