Simply lacking a belief in something doesn't qualify. If I lack a belief in a good Fast and Furious movie doesn't qualify me as an aVinDieselist, it just means I never seen one. Lacking is a state being deficient, which atheist are not because they have a obvious opinions about the gods, if they totally lacked belief they would also lack their opinions about the gods because any belief about the gods would be deficient and therefore unknowns. If you have absolutely no beliefs in or of or about the gods then the gods wouldn't even cross your mind or be part of the equation.
You are simply defining "atheist" and "atheism" in ways to force your conclusion. I'm not buying into your views of those things.