No they can't a guy can't
90% of the universe is undiscovered
What man has discovered uptill now is just using all by himself and it can alll be wrong on a universal level
You simply said knowledge. So I outlined how a mortal could theoretically get the knowledge of a god. It is my bad if I misinterpreted the meaning of your one word
That's the point it's only "theoretically"
If a guy is omnipotent then can he create a question that he doesn't know the answer of if yes then he isn't omnipotent if not then he doesn't know everything