God is that than wich nothing better can be. God must be all-good, all-knowing and all-powerful for it's better than being flawed. God must also really exist for it's better than existing at most in fairytales. So if God would not exist for real, they won't be the best possible entity. And it isn't like one can use the same argument for the best possible pizza as pizza has limits lime limited size and the ability to break. If your pizza was THE BEST THING, it would become a part of God.
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