I don't see how this is absurd; the fact is I CANNOT PROVE your existence! But, that doesn't mean either way that you do/don't exist. For practical purposes, I will assume you exist, but that doesn't mean that you truly do. No offence, but I see why it's that hard to doubt your existence
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I don't doubt my existence. But I can't prove it to anyone. As I understand it, that's how a good many born-again Christians, at least, feel about God.
They do feel like that about god. And I'm asking why? I can assert own existence a priori, but how can you assert god's existence a priori? My beef is that they have not yet given any argument in favor of this. Except the ontological argument, which seems to be simply playing around with language .