Is God omnipotent?
I think no. I will provide an example from scripture to support this as from the rationalist's standpoint I think any claim to omnipotence is quickly dismissed even before existence.
This verse from the bible shows that even the Hebrews did not think Yahweh was omnipotent:
And the LORD was with Judah; and he drave out the inhabitants of the mountain; but could not drive out the inhabitants of the valley, because they had chariots of iron. (Judges 1:19).
Even with Yahweh's assistance Judah and Yahweh are defeated by men with iron chariots. Not exactly impressive for a being that supposedly flooded the entire planet and magically murdered an entire generation of first born children.
Arguably we could say that this also shows God is not omniscient as if he were they would have known of this outcome and not wasted the time losing to the men with iron chariots.
So is God (who exists for the purpose of this discussion) omnipotent or are there limits to his power/skill/knowledge?