Fifty years ago, religious marriage ceremonies were the norm. Most people got married to someone who shared their faith, and just a small fraction of husbands and wives were in relationships where no one practiced a religion.

That trend, according to the latest American National Family Life Survey, is now on the decline as the influence of religion in society has been progressively fading.

The survey of 5,030 adults nationwide was designed and conducted by the American Enterprise Institute between Nov. 23–Dec. 14, 2021.

It found that while 81% of couples who got married before 1972 wed someone of the same faith, only 52% of couples who got married in the last decade reported being in same-faith marriages. Over the same period, secular marriages also grew from 3% to 16% of all marriages.

Americans increasingly ditching religious marriages: study | U.S. News (