I'm sure this is true in some cases but not all of them. I've barely ever talked to anyone about my own fall from grace as a child and then again after a relapse in my teens, it was almost a completely introspective experience although what is interesting is that my relapse into Christianity was very much a social product. Still, atheism has never been an important part of my identity. In my mind the fact that I don't watch televised sporting contests sets me further apart from my peers than the fact that I'm an atheist.
I de-converted my wife just by being an atheist and never making a big deal about it one way or another; I think she just needed to see an example of someone getting along fine without the theism.
I've never seen this or even imagined it can happen. I can't even write comments or pseudo-code that fast (without pause) because I can't design that fast.