Listen, if there are good arguments for something, and no arguments against it, then you have a rational obligation to believe it, at least until other evidence surfaces. That's the way clear thinking works. But in this case any argument was going to be irrelevant. Because he was convinced of his own point of view regardless of evidence and regardless of reason. Nothing I said would ever make a difference.
Some people are like that.
Don't let it be you. Here's the question. Because all the physical parts are replaced piece by piece every seven years. If you're 42 years old you've had 6 completely different bodies. You do it all the time.