For most Christians, Christmas is a day for family, not faith.

If that sounds like the triumph of culture over religion, it is. By the middle of the 20th century, Americans had embraced a civil religion that among other things elevated the ideal of family to a sacrosanct level. The Norman Rockwell image of family gathered around the tree became a Christmas icon that rivaled the baby Jesus. And Christmas Eve services — with their pageantry and familiar traditions — became just one part of the celebration, after the family dinner and before the opening of presents.