Originally Posted by Dotoar

No, and for the very reasons ou point out. Atheism as a concept points to the lack of belief in deity, nothing less, nothing more, although its common extension is a viewpoint of knowledge, but not necessarily and not by definition. Agnosticism is the viewpoint where one believe we cannot know wether or not there is a deity, or to put it more crassly, a position where one avoids making a decision at all, although in the process you end up in a theist position since the possibility of a higher deity is by no means rejected. Thus, the two concepts are incompatible, because the very moment where one, even on a theroetical basis, takes a stand even for the mere possibility of a higher deity, one is rejecting the concept of atheism.