So apparently this is a thing? http://www.openlysecularday.org/ It's kind of ridiculous that America needs such a thing, but "atheist" is still a dirty word in some parts of the country.
Anyway, if you dig through Contro archives you can probably watch my deconversion. Here's the abridged version I was raised Presbyterian and remember a day when I was about 10 years old and the family was getting ready for church, and it hit me that I didn't really believe. Based on the environment I was raised in, I thought that it was a failing on my part and sort of subconsciously adopted two strategies to cope:
1. Take an academic interest in Christianity so I could still fit in. It helped that there are plenty of interesting stories in the Bible. I always remember being really interested Old Testament stories (because I love mythology in general), but getting rapidly annoyed about New Testament stuff, particularly the Epistles, which always struck me as theological ramblings.
2. Try really, really hard to force myself to believe. Fake it until you make it, and all that. Particularly during late high school/early college, I did all sorts of damage to my personality by trying to act super Christian. It was unhealthy, and I was well aware how much cognitive dissonance I was intentionally applying to myself. It was a constant fight between two compartments of my brain.
Eventually, I got into a position where I didn't really have any social pressure to keep going to church, so I just quietly stopped thinking about religion, politely declined to lead the prayer at family dinners, and generally avoided the topic. That was nice.
But when my wife and I started talking about having kids a few years ago... I had to finally be honest with myself and admit that I just don't believe, any attempts were driven by emotional appeals or social pressures, and I had been going out of my way to break my brain trying to force it. Stress levels certainly went down that day. I recommend it.