The Conversion of Leah Libresco
I wrote an article some time ago about ex-atheist converts to Christianity. The main point of that article was to note that by reading their own accounts of their conversion experience, it is usually possible to discern that they had non-rational reasons for making the conversion. There are two key factors in these stories. First, they had never completely abandoned the religious beliefs that they grew up with, but retained some core elements of it somewhere in their psyche (such as the feeling that there must be an over-arching reason for our existence, for example). Second, these core elements of belief re-emerged when they encountered a period of stress or emotional need, and became the real impetus for their fully embracing religious belief once again, often accompanied by a sense of relief that they no longer had to pretend that they were atheists.