Wrong. Nobody has ever proven that God does not exist, just as nobody has ever proven that He does. It's simply beyond our ability to do...
I disagree. If you define God as omnipotent and omniscient, you introduce properties that end up contradicting each other. For example, an omniscient God lacks free will or the ability to change anything, which renders "omnipotence" meaningless. God has to know beforehand what he will do. Otherwise, he cannot know the future. But I invite you to read the book before rejecting its contents. Just bear in mind that it does not try to prove the nonexistence of gods, just the particular God that Christians, Jews, and Muslims tend to believe in.
Discussing"logical inconsistencies" isn't the same thing as proving something, because these "logical inconsistencies" only exist in how we try to understand God. You can, and I'm sure you will, disagree, but you're wrong -- not necessarily about the existence or non-existence of God, but about man's ability to prove it either way.
Well, I do disagree, and I think that I am right to do so. We can only discuss beings whose qualities we have defined. It is meaningless to say that you believe in something that you do not understand. Once you try to define God, you open yourself up to the possibility that you have imagined an impossible being. It is fair game for others to point that out to you.