That is my point, made by a much neater example, thanks! True omnipotence is impossible.
What existence do we live in, MM? Is it logical and consistent and sensible, or illogical and silly? And how do you know it's that? Is it possible that it's only
seemed logical and consistent and sensible across the brief interval of human history, but that it's been illogical and silly for a much greater period? Is the sense and consistency we presently enjoy real and eternal or is it feigned or transient?
Answer: we can't possibly know.
If we don't know, how can we know what's possible?
a being could be so powerful and knowing that for most all purposes it is all-powerful and all-knowing. Just, not quite.
Authors are all-powerful in their stories and all-knowing -- in the sense that any knowledge or curiosity that the characters ever express, is answerable authoritatively by the author (even if the answer is:
nobody is permitted to know that). If we were the fiction of another author (or perhaps programs on a cosmic computer), could we possibly know that we were?
My answer: Only if the author allowed us to.
Exactly why prophecy doesn't exist, it violates free will.
Free will is an axiom. We can't prove that we have it, or that we don't. But it's a very convenient axiom socially, because it lets us hold each other to account for our choices. It's also convenient psychologically because it gives us reason to try harder. So we like to believe that we
can make choices, even though there's strong statistical evidence that we're actually very constrained by our education, our social circumstances, our genetic heritage, our mental states and the chemical balances in our bodies.
(Prophecies by the way, have clever means of skirting contention with free will. If you don't specify exact details or exact time-frame then you can make predictions without saying exactly how or when or why they'll come to pass. Many prophecies are of this sort. Indeed, some
economic forecasts are of this sort.)
It's not just a string of synonyms. The concepts are clearly defined.
Actually, they're not. Even after 5,000 years of philosophy, we're still working at what 'truth' and 'knowledge' mean (links available if you're interested). If we can't confidently say what they mean, it's nigh impossible to talk about what omniscience means.
In physics, we're still exploring what 'cause' and 'effect' mean. If we don't fully get that then how can we talk intelligently about omnipotence?
My answer is this: if you're convinced that you know what those things mean, then you've defined them in a fiction that you believe in. That's absolutely fine -- but to make sense to others I think that you need to explain what your fiction is, and see if others agree to work within that frame.
So what's your personal fiction?
I suspect that among your fictive beliefs is that the world is consistent, sensible and logical, that all sensible questions have sensible answers, that answers can be worked out over time, and that all effects have causes. And that somehow, despite an orderly, predictable universe, people can still make choices independent of their histories and circumstance. That's an attractive fiction for free-minded people who enjoy logic and analysis (I do, and I agree with most but not all of those things), but not everyone does. And if they don't agree on those assumptions, can they possibly agree on what omnipotence and omniscience mean?
I'd suggest not.