but that's exactly my point.
first of all I was agreeing with you and the other user who said you can't know you are an atheist before you have been confronted with the concept of god. I was just adding my own experience that made me realize I have been an atheist all my life, I just didn't know it.
and second, we are talking about atheists in this thread who haven't "fully understood the concept", right? because we are talking about the lack of belief. and that includes the lack of deep understanding of belief or the concept of gods.
Again, from a personal, anecdotal experience, I really don't need to know more about god and religions to know that I lack this belief, this is what makes me an atheist. not the rejection of religion, it's the lack of belief, I don't need to know more about it, I don't even need to know that it exists.