It is widely assumed that people form large families because they hold traditional beliefs, and that when they abandon those beliefs, they stop creating those families. For Ms Eberstadt, the link between robust families and resilient faith is reminiscent of bonds forming a double helix: dynamic, self-reinforcing and flowing endlessly in both directions. And if there is one trend for her which has primacy, it seems to be the influence of the family on everything else. Where it is strong, people continue to pray, publicly and privately; where ties of kin disintegrate, so does religion
http://www.economist.com/news/books-and-arts/21576642-links-between-family-and-faith-ties-bind