I used to tell people that I was an atheist, and my wife told me I was more of a "fundamentalist atheist" because I wanted everyone else to be too.
Now I call myself a "Reformed Fundamentalist Atheist" because it captures that I don't care anymore (reformed), and it sounds enough like a real religion that people seem to accept it as one.
In the spirit of many of the good things on the internet, the Reformed Fundamentalist Atheist church (RFA) is of course an open source religion, under the MIT license :)
I have known several people who did not subscribe to any particular religion - actively shunned some - but described themselves as "spiritual". Others are self-described agnostics. Being an atheist is usually considered an active choice, not a passive one.
I'm nonreligious, I don't care to discuss it or think about religion as a part of my life, but it's okay if others want to be religious themselves.
Why don't I want to be labeled atheist? It's looked down upon and many hardcore atheists are exclusionary.
You know how when someone insists on it being GNU/Linux, but most people don't care? That's why I'm nonreligious (but technically atheist).