That said, here is a person who tackled this in a small scale for his Master's Thesis. Direct from RD.net:
About 6 months ago, I used this forum to look for volunteers from around Toronto who wanted to be interviewed regarding the process they took to finally seeing themselves as atheist. I received many responses and I ended up interviewing 10 individuals. I think what I found should be sent out to as many people as possible, so I'm providing a direct link to the study in pdf format. Understandably, the literature review may not be of interest to some people, but the heart of the thesis is in the findings section about the atheist construction process.
Here's a summary of the paper:
This study examines the atheist construction process through ten in-depth interviews ofthose who were raised in a religious background and who eventually became atheist.Atheists are a misrepresented percentage of the population in our redominantly Judeo-Christian society. The academic literature reflects this situation as there is insubstantialresearch pertaining to atheism. There is an absence of relevant material regarding howindividuals come to see themselves as an atheist, particularly in a Canadian context. The exploratory approach of interviewing provides atheists a voice in the literature, while simultaneously investigating Canadian atheism. It was found that a combination of socialfactors and individual/cognitive factors contributed to the process. Beginning the process with Primary Socialization, the participants entered a cycle that eventually led toatheism. The core of the cycle involves the following factors: Secondary Socialization,Cultural Forces, Replacement/In-Between, and Reading and Education. The peripheryof the cycle comprises the entirety of the examined factors, which includes Logical andCritical Thought and Doubt. Further, conversion theories provide a template for and acomparison with the atheist construction process.
And the link:https://www.sugarsync.com/pf/D81359_071787_811
Forward this to anybody you wish.
Hopefully this may prove of some use to someone. The link takes you to a PDF that you can download and read at your leisure. It's 80+ pages long. Hopefully it will help in the author's goals of putting a human face to atheists.