Can Someone be Simply "An Agnostic?"

[Rampant.A.I.]

It's unanswerable by nature of the question.

Not necessarily. One could construct an argument that does the following:

-Takes a leaf outta of the philosophy of mind's book and lays the groundwork for what constitutes the minimum attributes required for godhood (as philosophers of mind do for the concept of personhood), which would exclude a good many supposed god concepts (many of which really just amount to a worshipped superhuman). Then you proceed with counter-apologetics regarding what is left.

Most of the rest (at least the passage in the spoiler tag) seemed too much like a New Atheist anti-religion rant.

If you define an entity as extant for which no empirical evidence is possible, you cannot preclude such an entity with or with a lack of said claimed entity.

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And I don't actually think agnostic atheism is necessarily even a coherent position.

It's not. "I don't know, therefore God doesn't exist" is no more coherent than "I don't know, therefore God exists."