Every person comes to moments when they question what they believe. For me, I was born into a fundamentalist Christian home, came to doubt that worldview, and after lots of soul searching and learning, became a non-believer. Other people I know go through doubt and come out to be even stronger Christians. Similar evolutions happen for people in other faiths or people who have no faith joining a religion, etc.
Have any studies been done on what kinds of circumstances, personalities, etc. are involved when people change from one faith to another or between faith and non-faith?