A humorous take on the situation (because it really needs it), that I hope will bring a smile to your face before we see what Kripke has in store on Thursday. Done spur of the moment, no beta, minimal editing, so any and all mistakes are mine. Unfortunately, the boys aren't.
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According to Heaven and Hell, Sam Winchester is the antichrist, and his brother Dean is the messiah. Except their lousy execution of their duties is enough to give a fire and brimstone preacher heart failure. Sam exorcises every demon he comes across; angels just piss Dean off. Dean would happily perform the equivalent of an exorcism on angels if he could just figure out how…
As for Sam being an evil, world destroying figure…he doesn't quite make par. He saves people for a living, is far more interested in research than weapons, and he won't even kick a puppy. Not even a really annoying one that's been howling outside the Winchester's room all. He just feeds it.
Dean, on the other hand, will kick a puppy. He likes booze, sex, and has a questionable set of morals in the eyes of most people. Not exactly the Jesus, Messiah, God-like figure people have been expecting for the past two millennia. And has anyone mentioned that the angels would like lock Dean in tiny hole and hide the key until they absolutely need him?
And the thing that ticks both sides off the most is that knock-down, drag-out fight everyone was expecting between Lucifer's and God's vessels on Earth, the fight to end all fights, the battle for the world, is never going to happen. Because through death, destruction, brimstone, fire, and blood the Winchester brothers are still brothers. And that's never going to change.