Ahhh, you're trying to use the expanded version of atheism, favoured generally by atheist philosophers to pump up their claims about the number of atheists in the world, rather than the generally accepted one.
http://www.answers.com/topic/atheism gives rather more classical definitions of atheism.
If your ideas are solely rooted in non-belief, then they would be more like nontheism than atheism, as atheism classically involves either some form of denial or evidence based argument as to why god (small g deliberate) doesn't exist.
If you're going to take the true scientific idea, you can of course say that god is irrelevant, but that's agnosticism, rather than atheism.