Lance: "Since we live by logic, let's start with John's statement that the existence of a supreme being doesn't make sense. Prove to me logically that this is true."

Boooring. This is the old game: 'prove there isn't,' 'no, you prove there is.'

I have zero interest in convincing anyone that I'm right on this, but look at it this way: you're saying 'I know this is true,' and I'm asking 'how do you know?'