WASHINGTON — Here's a crazy idea: After all our ambitious child-rearing with Discovery toys, Suzuki piano lessons, conflict-avoidance classes, 4 a.m. swim practices, SAT prep classes, driver education and summer flights to study folk music in the Republic of Georgia, we might have done as well (and saved a lot of money) by just sending our kids to church, temple or mosque. Late last year, a commission convened by Dartmouth Medical School, among others, studied years of research on kids and concluded young people who are religious are better off in significant ways than their secular peers. They are less...