I guess stubborness and a massive denial of reality is required for a superstition to survive 2 milennia.
I had a Jehova's Witness prob a few years ago which was rather easy to solve in comparism. They take the bible literally. I pointed out to them that the bible says god created man as his exact copy. And it explicitly says man was naked. Hence we can safely conclude that god wears no clothes. - I never saw a JW anymore