WARNING: Leaving your religion can damage your health (courtesy of The Atlantic):
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…Americans are less religious than ever. A third of American adults under 30, and a fifth of all Americans don’t identify with any religion, according to a 2012 study by Pew Research (an increase from 15 percent in 2007). But though scientists have studied people who leave cults, research on the health effects of leaving religion is slim.
The most mainstream research on this is a 2010 study out of Pennsylvania State University, which examined data from 1972 to 2006. The study showed that 20 percent of people who have left religion report being in excellent health, versus 40 percent of people currently part of strict religious groups (such as Jehovah’s Witnesses and Latter-Day Saints) and 25 percent of people who switched from a strict religion to a more lenient religion. “Strict” in this study was defined as “high-cost sectarian groups that are theologically and culturally exclusive.”
There are some studies comparing the health of religious and nonreligious people.