In the end I asked him: "You are honestly telling me there has never been anyone in the entire history of humanity who has looked at a body of evidence (however flawed) or followed a train of logic (whether misguided or not), and concluded that theism is true and naturalism false?"
His answer: "Yes."
I was dumbfounded. I didn't know what to say. It wasn't about me trying to convince him my beliefs were correct. It was about trying to convince him that he couldn't possibly think it reasonable to take it upon himself to tell every theist who ever existed that they didn't employ logic, even bad logic. He wouldn't even accept that theists used bad logic. Only no logic.
The length that some people will go to to remain ignorant astounds me.
Humanity makes me sad sometimes.