What bearing does any of this have on a debate with a christian? Is the christian supposed to think "OMG I can't figure out if God can move the rock or not, therefore christianity = fail!". From what angle would you even use this argument? A christian would just say "God is God", and that people who present such logical arguments are "professing themselves to be wise, but become fools".
I just don't see this achieving anything with my fundamental friends.
Not being a professional philosopher I thoroughly appreciated this little morsel, without feeling the need to mount a rebuttal or a defense. But I'm astounded at the amount of energy that has been expended arguing about a fictional character with fictional superpowers. I mean, outside of theological constructs and debates is there any factual proof (dna, blood sample) of an "omnipotent being"? I'm being facetious, but really outside of mental constructs there is no proof.
Of course I'm an atheist. However, I doubt that any rational argument will sway a true believer. It was my own gradual pursuit of truth and never a single argument that finally convinced me that I could no longer believe in my imaginary friend.
Homer : "Could Jesus microwave a burrito so hot that he himself could not eat it?"
Ned : "Well sir, of course, he could, but then again... wow, as melon-scratchers go that's a honey-doodle."
Ahh the Simpsons, is there anything they don't apply to?
"there exists a possibility that the universe has existed since forever."
Wait, what? Please explain what you mean by existed since forever. I'm not a professional physicist but I'm reasonably sure there is overwhelming evidence that the verifiable universe is nearly fourteen billion years old. This may seem like a long time but it is certainly not "forever."