Omniscience: A thought experiment

[Mudhammam]

Let's say you're God-- how do you know there is no other God? Haven't experienced one? Never met one?

I know because I am the primal being that all else is predicated on. If there exists knowledge that is predicated on something other than my all-knowing self, then THAT something is prior to me and is the primal being that all else is predicated on. And if that other being finds itself in the same shock and awe at my existence that I find at hers, then there must be a third being who is laughing at our expense and who is more primal and knowledgeable than us both!

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But yeah, it's a little beyond the stretch of my imagination to consider how an all-knowing subject could perceive of itself as unperceived object and that would seem to be required of a being who knew everything both internally and externally of itself.

Or, does the Supreme being still remain Supreme when no inferior beings are around to worship him?