You know the type, the ones that say, "Oh yes. I tried to not believe in God..." or "When I left the JWs I became an atheist, but since I found Jesus..." Simply put, I don't believe them.
I don't think they EVER really stopped believing in God. I think they went through a phase, a period of doubt that lasted for a moment. There probably was not a lot of research or thinking put into their temporary non-belief in God, just a feeling. Not liking this feeling they rededicate themselves to Jesus or get swayed into some Evangelical movement. Then they can say, "You know, I was an atheist once..." and rattle off how they have since "seen the light." This is supposed to be an example for atheists or agnostics of someone who was "one of them" who is now a Christian. I find personal examples like this wholly unconvincing. Simply put, they were "atheists" for all the wrong reason.
So, that's what I think is happening with people like this. Their "atheism" was not a clearly thought out, reasoned quest to find out if belief in God or the Bible is rational. No, their "atheism" was a passing fancy not backed up by research or honest introspection. Just a thought I've had.
Bradley