“I am not questioning your honor, I am denying its existence.”
“The argument goes something like this: "I refuse to prove that I exist," says God, "for proof denies faith, and without faith I am nothing.”
“I am not your justification for existence.”
“I am the Eschaton. I am not your God.I am descended from you, and exist in your future.Thou shalt not violate causality within my historic light cone. Or else.”
“Notice this rent in my garment; I am at a loss to explain its presence! I am even more puzzled by the existence of the universe.”
“I want to kill this degenerate bastard brother of yours. But I am not selfish, I do not want to deprive you of that honor.”