I'm putting my money on Shiva the Destroyer, unless you throw Zeus or Thor into the ring, which would change the dynamics a little, but maybe not the result. Also, Jehovah and Allah are two names for the same guy. I think you have to basically toss Jesus almost immediately. He's not going to take his old man. Really, as gods go, you have to give a lot of respect to a guy capable of flooding the whole planet, but since none of the gods are really confined to the planet, I'm not sure how far that power would go for him in a rumble. Santa's probably out as fast as Jesus. He doesn't really have powers other than the sleigh and perhaps a magic gift bag. Even if we assume that he can pull stuff like rocket launchers out of that bag, I don't think his tech advantage keeps in the fight long against real god-like powers. Budda is a peaceful dude, and not even a god. He's just a really smart guy. He may be clever, but that's not going to help him much against floods, lightning bolts, or Thor's hammer. On the other hand, if you kill him he just moves on to the next plane of existence, and could even reach nirvana, so the guy could win by losing. However, I think that's perhaps a bit too metaphysical and we should just figure out who's left standing at the end of the brawl. So, once again we're going to say Jehovah and Allah are the same guy. We also have Shiva, and lets include Zeus and Thor. The real key to this four way deathmatch is whether Jehovah/Allah is the vengeful, Old Testament guy, or the mellower, peace loving New Testament guy. If think that with the New Testament and the Qur'an being the books currently accepted, we have to go with the newer, mellower God. Despite the irrational violence often done at the hands of Christians and Muslims, the books teach about a peaceful god. Based on that, gods like Shiva, Zeus, and Thor, who are a little more willing to use violence and aggression to achieve their ends get the nod. Of these, I think Zeus is out first. He's a powerful dude, but with just that lightning bolt his weapons are limited, and he's got too many other inter-god rivalries going on. While Thor is just kicking butt and taking names, Zeus has to watch his back to keep track of what Hades and Poseidon and others are up to. Now we're down to Shiva and Thor. Thor is one tough god, there's no disputing that, and as godlike weapons go, that hammer really rocks. Not much is going to withstand that, but some gods might. Finally, we come to Shiva. While Thor is a formidable fighter, I think when it comes to total bad-asses, Shiva stands alone. He wears serpents as ornaments, he has the garland of skulls, he has a demon holding a cobra at his feet. If anyone but another God saw this, they'd poop themselves. Then he controls fire and weather, and having that third eye has to give him a tactical advantage in combat. When you're not dealing with serpents and demons and snakes and fire and wind and lightning, or ducking the heads of some of the other gods he's already decapitated, he's running you through with his trident. He's the father of three other gods, and as the supreme god, probably has additional forces at his disposal. Sorry, other gods, but don't mess with Shiva.