The question is not a logical fallacy.
The assumption is made that God is omnipotent.
Omnipotence is the ability to do anything.
So if god can do anything, can he create a rock that he cannot lift? That is a perfectly sensible question. When we ask it, we run into a paradox, which does not mean the question is logically flawed. It means that the concept of omnipotence is flawed.
It shows that while we can create the idea of an omnipotence being, the concept cannot be applied to the world as we understand it. Just like we can create the idea of a circular triangle yet we will never find one in this world.
So in a sense saying that god is omnipotent is like saying that god has a circular triangle head.
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