This seems tautological, since it is based on the (unstated and undemonstrated) assumption that atheism is a framework, not a property.
Atheism is the framework that gods do not exist.
It is believed to be (or understood as) lack of belief in what theism believes - namely that god(s) exist.
Again, within context of this thread, that 'property' would accurately apply to human babies, and likely stay consistent with them (as long as human remains infant in awareness). In adult atheists, the property would become, I argue observably so, a framework. A basis of rationale, in which it isn't merely 'lack a belief,' but argued as, 'lack a belief, because evidence so far presented doesn't provide conviction or adequate reason to conclude existence of God(s).'
Therefore the framework would start, and be perpetuated by beliefs around 'what is reasonable evidence for existence of God.' For if human asserts that God is equal to all physical items in known universe, then that would contain abundance of evidence for existence of God. Yet, atheist could say, "I lack belief that this is evidence of God."
Which is what I contend atheists are more or less saying. There is a framework that is discernible in discussions, when atheist types engage in debate. Based on sense of strong atheism at work, there can never be anything that is evidence for God, because the (actual position and) belief is god(s) do not exist.