His epistemological tools do not lead him even close to the truth, so you can assume he is wrong about everything.
Like I said before, the scientific method is the best tool we have, anything else can easily lead you to mental masturbation or worse, delusion or schizophrenic episodes. You know the I am the prophet, I have found the light type of conditions.
Translation: His arguments lead to conclusions that falsify what I have arbitrarily and subjectively defined as "truth" so I am going to assume he is wrong about everything and stop thinking about his arguments.
I'm not assuming anything, you are. Your arguments show humans cannot determine whether something is true or not. It's also really easy to prove that using the scientific method works far better than simply using your reasoning and logic. For example:
Let's say you don't know much about anything. An apple falls on your head, you start to think about it, why does that happen? Will you ever be able to determine it's gravity only using your logic without performing any experiment or gathering evidence? Of course not. In fact logically, the earth could simply be accelerating upwards, that would make sense logically and would explain the apple falling.
Now all you are saying is that the people who put the scientific method together, did it without using logic. So, they got the scientific method some other way than through logic, right? It must have been told to them by God through the Bible. Why else would they believe that science theory, which can be changed at any moment by the whims of scientists making a directional change in what they observe (based on their desires), is the truth? It's all about religion. The whole scientific method is a religious thing... and we know that religion was around long before modern science.
So, using the scientific method, I have just proven that science is an illogical branch of religion. And you helped me do it through your post that I quoted.
EDIT: Btw, ever heard of the expanding universe? There isn't any gravity. It's the inertia of the expansion that gives the impression of gravity.