The obvious problem overlooked with describing God is that describing what He is not is to assume there is a god (or gods) in the first place.
The problem is really the same as describing unicorn with positives. That is, a horse with a straight horn on its head. The speakers assume there exists something horse-like with something horn-like on its head-like part.
The difference is that God has no attributes to describe (which is its description) and a unicorn had attributes to describe. Either way we have described an assumed something.
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