No religious position is loyally served by refusing to consider annoying theories which may well turn out to be facts.
He knew a lot about his grandparents - and perhaps he feels he's been endowed with abilities to go into people's heads who are long dead - but, to a certain extent, he's making it up.
I'm not that tough; I'm not that smart. I need life telling me who I am, showing me my mind constantly. I wouldn't see it in a cave.