Anselm's argument examined.

[MindForgedManacle]

I think Esquilax brought up one of the better ways of showing the argument to be fundamentally flawed. Further, another reductio ad absurdum can be constructed which should defeat the argument as well: flip the moral property. Theists who use any of the various ontological arguments for God's existence claim maximall goodness (omnibenevolence) is a necessary property for the supposed Maximally Excellent Being. Well, then simply flip that property to maximal evilness (omnimalevolence), run the argument, and then I've logicked into existence an omnipotent, omniscient and omnimalevolent being. But there cannot be 2 omnipotent beings who exist simultaneously? Yet ontological arguments can be just as validly used to establish both.