If he wants to define the god we don't believe in as the Universe, I'm okay with that. My response would be to agree that it does indeed exist; but I would dismiss the claim that it is a god. That's the part for which I would need to see some evidence - but since he's shooting his own argument through the head by insisting he doesn't need to show evidence, that really is the end of the conversation.
At the age of five, Skagra decided emphatically that God did not exist. This revelation tends to make most people in the universe who have it react in one of two ways - with relief or with despair. Only Skagra responded to it by thinking, 'Wait a second. That means there's a situation vacant.'
