The obvious refutation being that you can't really describe an omnipotent being capable of doing anything, even defying logic, as rational.All rational beings believe in their own existence, whether or not they actually exist. Sherlock Holmes believes that he exists, but he is wrong. God too believes in his own existence–and his omniscience makes it impossible that he is mistaken. Therefore God exists.
However, a very interesting proof.
I also liked the one by Charles Lewis? that Jota posted in some far off thread a long while ago:
A really interesting one against the omnipotence = no free will controversy.First, an observation. If God did not know the future, there would be no problem, because he could only watch us as we acted. And to watch someone do something is not the same as making someone do it. But God has perfect knowlege of the past, present and future, which essentially means that from God's perspective, time is spacelike. That is, the whole of the life of the universe can viewed by God at once, like a mural. So from God's perspective, all the actions of your entire life occur in his "present." But the first observation says that observations in the present do not affect free will. QED.
It's my favorite.
Any of you have some to share?
Preferabley also related to religon, though I don't really mind if it's about something else, instead.