Well, Common Sense Atheism is a resource by a respected member here who documented his extensive investigations into theology, philosophy and so on, which he started as a devout Christian and finished as an atheist.

Unequally Yoked is a blog coming from the opposite end, someone familiar with the language of rationality who started out as an atheist and ended up as a theist.

I don't actually know where Leah (the author of the latter) archives her writings on the process of her conversion; I've really only read Yvain's commentary on them, but she's a member here and the only person I can think of who's written from the convert angle, who I haven't read and written off for bad reasoning.

By the time I encountered either person's writings, I'd already hashed out the issue to my own satisfaction over a matter of years, and wasn't really looking for more resources, so to the extent that I can vouch for them, it's on the basis of their writings here rather than at their own sites, which is rather more extensive for Luke than Leah.

However, I will attest that my own experience of researching and developing my opinion on religion was as much shaped by reading up on many world religions as it was by reading religious and atheist philosophy. If you're prepared to investigate the issue thoroughly for a long time, I suggest reading up on a lot of other religions, in-depth. Many of my own strongest reasons for not buying into common religious arguments are rooted, not in my experience with atheistic philosophy, but my experience with a wide variety of religions.