@MattDavis,
You ask "how well does the label serve
you ?", but this begs the question of a consistent "self" with respect to that label. Observation usually reveals to
those capable of it, that such a "self" is an illusion. My "atheist self" is
evoked by circumstances like observing the crowds in Rome applauding an old man in a white frock, or occasional TV glimpses of Islamic clerics sounding off about the appropriateness of dolls for girls but not boys. The label is therefore coextensive with a
fleeting realization of the incredible sheep-like nature of much of mankind, but then it passes having served the purpose of reinforcing a socially cynical aspect of what I call "self". But I can equally be moved by individual cases of what I call the "spirituality" of others (other than old men in frocks) whether they attribute it to their religious belief or otherwise. In those instances my atheistic label has no function since the cynical self is at that point not operating.