Jumping off another thread - I'm not sure where the fault in the Ontological Argument is:
http://en.wikipedia.org/wiki/Ontological_argument
Anselm defined God as "...that than which nothing greater can be conceived," and then argued that this being must exist in the mind; even in the mind of the fool who denies the existence of God. He suggested that, if the greatest possible being exists in the mind, it must also exist in reality. If it only exists in the mind, a greater being is possible—one which exists in the mind and in reality. Therefore, this greatest possible being must exist in reality.
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