The Ontological Argument for the Existence of God

[coldwx]

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I have to ask, if you have never seen the argument before how can you then claim something is a common tactic used against it?

Good question. In the course of my reading, at Wikipedia (or maybe Stanford Encylopedia recommended by Cato), I came across the comment that parody is a common approach to addressing the Ontological Argument. The first was by some monk who substituted "perfect island" in place of "maximally great being" and showed how he could prove the existence of such an island using this proof. (Later, critics refuted his refutation, but the idea of parody was born early.)

So it is not a common tactic that you have heard, just something you read on Wikipedia.  Did you also address the Devil's Corollary parody?