> But an omnipotent being could make impossible things possible, right?
No, as far as I understand your question. God can do things that we as humans consider impossible (such as a virgin birth), but He cannot do things that impossible because they are absurd (a square circle).
> Otherwise whatever causes things to be possible or impossible has power over the supposedly omnipotent being.
You mistake the notion of power with the concept of reality. Suppose I can't teleport to Saturn. That's not because the powers of non-teleportation have power over me—there ARE no powers of non-teleportation. Back to God. There is no such thing as a square circle. Irrational absurdities don't deal in power, nor do they have power. They are nothing more than the lack of sense, viz., nonsense.
> If God can't change his will, or reality, then he's not omnipotent.
God change His will. He has free will and the authority to change it, as the Bible adequately shows.
> You'll have to prove that the "omnipotence" does not mean "the power to do anything." Because I do not accept that statement.
Then, as I said, you must give counter-argument with more weight, proving to me that "omnipotence should include the irrational in order to be rational." If you find that claim more acceptable, you must show me so.
> Kinda seems like you're proving all my points for me.
Not a bit. I've shown you on every turn how you are wrong, and you have so far neglected to step up to the plate with a more acceptable definition and explanation.
> I really like that you brought up God's omniscience. If you're still willing to play ball, I've got a little question to ask you:
You haven't responded with anything rational about omnipotence, so I don't know why I should venture into another realm of absurdity, but for now I'll play along.
> If God is morally perfect, does he know what it's like to want to commit evil?
You've stepped outside of omniscience already. This is a question of morality, not omniscience, and it's another absurdity. Let me throw out a few nonsense questions for you, all of which are in the same vein:
- Does God know what it's like to not know everything?
- Does God know what it's like to learn?
- Can God really believe anything?
- Can God think?
- Etc. ad absurdum
Just like omnipotence, people drastically misunderstand and abuse what omniscience is. When we say that God is omniscient, we are undeniably talking about all things that are proper objects of knowledge. For instance, God doesn't know what it's like to learn, he doesn't know what it's like not to know everything, he doesn't know what would happen if an unstoppable force met an immoveable wall. These are absurdities. By omniscience we mean that God knows himself and all other things, whether they are past, present, or future, and he knows them exhaustively and to both extents of eternity. Such knowledge cannot come about through reasoning, process, empiricism, induction or deduction, and it certainly doesn't embrace the absurd, the impossible, or the self-contradictory.
To complicate the problem of defining omniscience, it can't be established what knowledge really is and how it all works. What are the principle grounds of knowledge, and particularly of God's knowledge? Does he evaluate propositions? Does he perceive? What about intuitions, reasoning, logic, and creativity? We consider knowledge to be the result of neurobiological events, but what is it for God?
But let's continue on to the true issue at hand: Is an omniscient being capable of thought? Of course he is, because thoughts are more than just knowledge, and they are more than just evaluating propositions, and the Bible defines God's mind as...
- creating new information (Isa. 40-48)
- showing comprehension
- gaining new information (Gn. 22.12, but it's not new knowledge)
- He orders the cosmos (Gn. 1)
- He designs (viz., the plan for the temple)
- He deliberates (Hos. 11.8)
- He can reason with people (the whole book of Malachi; Gn. 18.17-33)
- He can change a course of action (Ex. 32; 1 Sam. 8-12)
- He remembers (all over the place)
None of these conditions negates His omniscience. Generation of thoughts is not a process that negates His omniscience. If God is going to be responsive to human free will, which the Bible indicates He is (Jer. 18.1-12, Jonah 3), then thought does not imply a change of divine characteristics.
Is God's omniscience propositional or non-propositional? Can God have beliefs (since beliefs can be true, and beliefs are different than knowledge)? Are God's beliefs occurrent or dispositional? As you can see, this can all get pretty deep pretty quickly. At root, a cognitive faculty is simply a particular ability to know something, and since God knows everything, his cognitive faculties are both complete and operational. Perhaps we can define God's omniscience as:
- Having knowledge of all true propositions and having no false beliefs
- Having knowledge that is not surpassed or surpassable.