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> A clown is not "that for which no greater horror can be conceived"

I don't know, some people are really scared of clowns.

Also as a reminder, your "proof" is something made up throughout history along with thousands of other denominations of thousands of other religions of thousands of other gods people have conceived through thousands of years. I can imagine many great things and it doesn't mean it exists, that's where this "proof" fails. Calling this "proof" is, if not a lie, but a big detriment to the notion of proofs already tested and held dear.

As an addendum, if you follow your logic then you're still left with the old 'who created God' argument because although you might imagine some great entity, any entity that god can imagine should surely be greater than the god you imagine so their god must be true. You still have the infinite egress problem diluting your "proof".