The three most widely celebrated Jewish holidays are Yom Kippur, Hanukkah, and Passover. Yom Kippur is celebrated with a fast and prayer. Over half of Jews in America fasted for at least part of Yom Kippur in 2012. An even greater number attended a prayer service on Yom Kippur. That’s a huge number considering fewer than a mere 55% of Jews believe that religion is either very or even somewhat important in their...