Presumably, then, he remains agnostic about the existence of any country he hasn't visited or any person he hasn't met.
It really isn't hard to get some first hand experience of this sort. Some of the death camps are open for visitors. There all sorts of contemporary newspaper accounts, historical documents, museum artifacts. Of course, they could all be part of the great Jewish conspiracy, I suppose.
I would assume so. Heck, I haven't an engineers knowledge of the workings of my computor or the internet, who knows what's coming out on your end. By his standard I guess ole Joe knows for sure he rises in the morning, eats, goes to bed at night, as a pundit, not much else.