Here is something to consider. Perhaps with AV, his faith is an all or nothing thing.
If even one article of that faith could be falsified, even the tiniest thing, perhaps it would shatter the whole structure.
He and I are not on speaking terms, but maybe someone could find out if that is the case.
See, the thing is that IF that it true, then two things seem to me to follow.
One is, he will always find a way out of any logical contradiction, fact, data point, anything because he HAS to find a way out.
I am reminded of the guy i beat in Jr. High, in chess. But he defeated my winning move with a countermove that is against the rules. I protested; he said he was playing with "French rules". See? You can never win with some people.
The other thing I think about here is, suppose someone actually did somehow cause AV to see the light, that 2 plus 2 really is 4 and there is now way out of it.
Then what happens to his faith? I dont know if its really right to doggedly pursue this effort to make him see that his ideas dont make sense. A person might want to consider the possible consequences some more before continuing.