At the age of nine, I stopped believing in the existence of gods, because there seemed to be no evidence for the kind of supernatural power asserted by those around me. I don't see my lack of religious belief as a matter of ideology, which is why I prefer the term "non-believer" to the term "atheist" (one who actively disputes the existence of gods, often in a militant fashion) or "agnostic" (one who doesn't think there is enough evidence one way or another to determine if gods exist).