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similarly, atheists are behaving theistically when engaged in making moral (but not necessarily ethical) distinctions.
I'd say there's a distinction to be made between theism and moral or meta-ethical theorizing. Speaking about morals is not theologizing in the usual sense of the word, and there are ways of conceptualizing morality which bear little resemblance to concepts of divinity.
On the other hand, the perspective of many western atheists is closely related in some ways to the monotheistic worldview, at least in the sense that atheism is not typically merely an assertion about the existences of certain classes of entities, but an ontological and epistemological view of reality that is posed over against the traditional monotheistic views.