According to the General Social Survey, 15 percent of U.S. households were mixed-faith in 1988. That number rose to 25 percent by 2006, and the increase shows no signs of slowing. The American Religious Identification Survey of 2001 reported that 27 percent of Jews, 23 percent of Catholics, 39 percent of Buddhists, 18 percent of Baptists, 21 percent of Muslims and 12 percent of Mormons were then married to a spouse with a different religious identification. If you want to see what the future holds, note this: Less than a quarter of the 18- to 23-year-old respondents in the National Study of Youth and Religion think it’s important to marry someone of the same faith.
But the effects on the marriages themselves can be tragic — it is an open secret among academics that tsk-tsking grandmothers may be right. According to calculations based on the American Religious Identification Survey of 2001, people who had been in mixed-religion marriages were three times more likely to be divorced or separated than those who were in same-religion marriages.