I know this mindset because I used to have it. He views the bible as something with even more validity than the constitution becuase your whole life you're taught that bible morals and verses are the only thing that is undeniably true and he feels like anyone who thinks otherwise is probably choosing to be ignorant and their opinion is worthless. Its the same reason why some Christians accuse atheists of being devil worshippers. They don't understand that Christianity actually isnt a big part of everyones lives and we aren't walking around choosing to ignore something that we secretly believe to be undeniably true because we want to live in sin. Its hard to grasp that we don't actually care what the bible has to say