- God is a being than which nothing greater can be conceived.
- It's greater to exist in reality than only as an idea.
- Assume God exists only as an idea. In that case, we can conceive of an even greater being—one that exists in reality—which we can then call God.
- Therefore, God must exist in reality.
- SuperSatan (SS) is a being than which nothing worse can be conceived.
- It's worse for SS to exist in reality than only as an idea.
- Assume SS exists only as an idea. In that case, we can conceive of an even worse being—one that exists in reality—which we can then call SS.
- Therefore, SS must exist in reality.
Enter my new character: SuperSatan. He's the worst guy imaginable, which includes being all-powerful, all-knowing, and infinitely malevolent. Naturally, it would be worse for SS to exist in reality than as an idea: after all, he can do a lot more damage if he's real than if he's a product of my imagination. The thing is, there's nothing like SS within Christianity. God's power is supposed to be on a level all its own, but if SS were real, he would certainly be giving God a run for his money.
Thus, either Christianity as practiced by pretty much all Christians is false, or the ontological argument is flawed. (Or both, but that's another issue.) If Christians want to continue believing, they can't very well use this argument as a proof of the existence of God.