As I understand the argument,
1) I know that reality exists outside of what I can perceive directly with the mind.
2) If reality exists outside the mind to the smallest degree, then it exists to an infinite degree.
3) If it exists to an infinite degree in this world, then it exists in possible worlds.
4) If it exists in possible worlds, then it exists in the actual world.
5) Therefore a being self-existing in infinity exists in the actual world.
6) This being is God.
I don't agree with #2. An infinite degree doesn't mean anything to me. Also, going from reality exist to a self-existing being existing. If reality is the being then all we've said is that if reality exists then reality exists. Tautologically true.
Too, the whole idea that if something is possible it impinges on our "world." This isn't evidence as far as I know.
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