By definition, an atheist is someone who doesn't believe in gods. Not believing in gods is the necessary and sufficient condition for the term 'atheist' to be applicable.Hmmm...it's also my reason, albeit a shorthand version of it I suppose. I see no reason to believe in a higher power, higher powers, or whatever. There are a lot of things I don't believe in, simply because I see zero reason TO believe in them. My basic starting point on anything would be skepticism I suppose.
I'm not an atheist due to issues I have with religion, since I would separate God and religion. Even if I thought every religion in the world was ridiculous, I would still not be an atheist if I believed in a God. Likewise, whether the thought of a higher power is something I like or don't like is irrelevant. It's about what I believe to be true (or absent)...not what I want to be true.
[edit]It strikes me that my earlier post could easily be read as me saying my way of thinking is the only way, or the only true reason, or whatever. I actually meant it with all sincerity. Up to this point, I have always pretty much thought believing there was no God was the only reason.[/edit]
So to say the reason for someone being an atheist is that she doesn't believe in gods, would be equivalent to saying, "The reason for her not believing in gods is that she doesn't believe in gods.", which itself would be circular, or a non-statement. It's just a repetition of a definition rather than a reason. That's what I meant by saying that it's a definition, not a reason.
It sounds to me more like you're saying you don't need a particular reason to be an atheist, or that you don't have a reason to believe otherwise, rather than saying literally that the reason you're an atheist is that you don't believe in gods.
You edited your post by saying that your earlier post could have been read as an exclusive statement, which is how I interpreted it as. Since that's not how you meant it, this really isn't a big deal. Just pointing out what I meant by saying it's a definition rather than a reason.