Atheism is a faith choice, just like theism is. The atheist does not know, yet chooses to presume, that there are no gods. And then he lives his life as if this is so. Just exactly in the same way as the theist does not know, but chooses to presume that there is a God of his own understanding and then to live accordingly.
I don’t recall ever making a choice to be atheist.
It’s just a label that others applied to me as a child just because I believed that God does not exist.
Atheism is not in general a choice, although given enough motivation, one could change one’s beliefs thru sheer willpower, alone, no doubt.
I do that with other stuff, so I’m sure that I could do it in the end.
On the other hand, even if my wife were atheist, Catholicism would still be a significant part of her identity.
I think that it is more accurate to see religion as a part of one’s cultural and historical identity, rather than a choice.
The language of individual choice implies a whole slew of western cultural concepts that may or may not be actually present.
The advantage of taking this approach is that it allows anthropologists to do their job their way, without blatant cultural biases of rugged individualism.