Okay, before I start out, let me make two things clear: 1. This is only a proof against certain Gods, such as in Christianity and Islam. It isnota proof against many other religions, or the deistic God. It is alsonota proof that atheism is true, for this exact reason. 2. In general, the proof only applies to an omnipotent, omniscient God, who created the universe and gave us free will. If the God you believe in does not fit that description, then this proof does not apply to you. (But feel free to reply anyway, of course!) Summary of the proof: It is not possible for there to exist an omnipotent, omniscient God, who created the universe, to have given us free will. Such a Godcannot exist. Therefore many religions, including Christianity, must be false. The full proof: P1God created the universe. P2God is omniscient. P3God is omnipotent. P4Humans have free will. #1. At the instant of creation, God already knew everything that would ever happen in his universe. (By P1 and P2) #2. God designed the universe inexactlythe way he wanted it. (By P1 and P3) #3. Everything that ever happens in our universe is exactly what God intended. (By #1 and #2) #4. Everything that ever happens in our universe is/was God's choice. (By #3) #5. The outcome of every choice you ever make was already predetermined by God. God is responsible for everything. (By #4) #6. You are not actually responsible for any of your actions; at best, your free will is an illusion. (By #5) #7. Humans do not have free will. (By #6) #8. Contradiction. (By P4 and #7)
Common false responses to this proof: A"#4 is wrong, because God gave us free will!" - No. You are missing the point entirely. #4 follows directly from #3. Unless you can explain how it actually does not (or explain why #3 is false), it is illogical to simply claim "but God gave us free will, therefore #4 is false".B"But you already assumed that God gave us free will, so of course it makes sense to do that!" - You don't seem to understand how logical proofs work... Here's another simple example of one:
P1 All cows are black.P2 Daisy is a cow.P3 Daisy is white.
#1 Daisy is black (By P1 and P2)
#2 Daisy is not white (By #1)
#3 Contradiction (By P3 and #2)
Can you see how I have not used P3 anywhere in the proof, except in the final conclusion that there is a contradiction? Do you agree that the logic is all correct, and that it follows a very similar pattern to my original God proof? It is NOT logical to say "#1 is wrong, simply because it disagrees with P3"!
Now look back at the original God example. It is the exact same thing, pretty much.
C"But God exists outside of time, so there is no contradiction." - Huh? This is an extremely common response, despite it making no sense whatsoever. God being outside of time (which, I agree, is true) is irrelevant. It makes no difference to the logic in the proof.D "(Due to quantum physics) our universe is NOT predetermined, therefore God didn't choose everything..." - This is a red herring. If God does not know the outcome of any quantum events, then he is not omniscient. Hence we can still conclude that the universe is all predetermined; even if it appears random to us.E "God COULD know what choices we are going to make, but he chooses to block that own knowledge from himself" - If this is true, and God is forced to block his own knowledge of things, then he is not omnipotent.F "The future does not exist. God does not know things that do not exist. Therefore God does not know the future" - Another red herring. God must know the outcome of every single event in the universe. He knows exactly where every atom in the universe is. He knows exactly what the future will be, even if this future "does not exist, yet".
That's it, for now. If any other incorrect responses come back, I'll add them to the list.
Until then, feel free to make me look like an idiot and prove me wrong. If you can.