My point is that no test will tell you whether the potato is God or not, because there's no coherent definition of a real god. And that's because no one uses a coherent definition of God appropriate to a real God, one who exists in nature.
Ah ─
god = an intelligent, immortal entity that has a degree of control over all things in the universe and more control over at least one specific aspect of the universe than any mortal thing.
That doesn't define the 'entity' in any way that would allow us to identify real candidates, so it's not a definition appropriate to a real being, at least not as it stands. I want the test that will determine whether the potato, or my keyboard, or radiation in the green band, or any other real thing, is God or not. I want to know
what real thing we're hunting.
And 'immortal' may be fine for an imaginary God, since
immortal is an imaginary quality, and as a claimed aspect of reality has no test that could establish whether the entity was immortal or not. The same would be true were someone to say the entity was omnipotent, omniscient, omnipresent, perfect, eternal, self-created, and so on. (Indeed, how does God know [he]'s omniscient? Know that there aren't things he doesn't know?)