No, that is not my position.
I simply asked how you know that the existence of God is impossible or that omniscience is impossible. Your reply questions my position on certainty, which is fine, but you did not answer the question as to how you could know such a thing. It seems to me that you would have to be either omniscient or have searched throughout the universe to demonstrate that your proposition is true, which, if you had, would render the proposition self-refuting.
Cordially,