Atheists, by and large, have let their opponents define them in the public mind by what they do not believe. And I strongly suspect that actually is a fair way to describe most atheists.
But there is another breed of atheist: An atheist with a body of positive beliefs that either makes the existence of god irrelevant or implies that god does not exist.
An atheist of this sort can fairly be called a technical atheist (let us say, by definition) -- in contrast with the prototypical, purely negative atheist that exists in the minds of most religious people. (And perhaps in the minds of most atheists, too?)
For the technical atheist, the existence of god is merely a side issue, not the main show or the core issue of life. And certainly not the issue that should be the main line of division between people in Western civilization.
In sorting out the concept of technical atheism, there is more to be said, especially on the possibilities for a body of positive beliefs that is compatible with atheism -- or more accurately, on what might be called a proper body of positive beliefs, actually for anyone.
(Oh, my goodness. Did I fail to mention that I am a technical atheist myself and that I am looking for other technical atheists?)