I’d bet money that everyone on this site believes deeply in something that others would fine unusual, mainly because it’s been culturally or religiously significant to them.
Moral authority (elders, traditions, cultural norms) can be helpful in some ways, but they are much more crude and error prone. Respected elders can prey on children, long-held traditions can be oppressive and even harmful (genital mutilation, circumcision). Cultural norms can create significant social costs (women keeping house rather than starting companies or curing diseases, men spending weekends bored out of the social pressure to pretend to like various sports, ec.)
When the average person flips on a light switch they believe they know why the light turned on -- electricity! wire! -- but few could explain it much more specifically than that and could not ELI5 it. So in a sense they are expressing a faith-based belief. But most people can tell you who does understand it and know how to find more detailed explanations if they care to learn. This is quite unlike religious faith/tradition which demands that people profess beliefs that are impossible. When you think about it, the word faith means nearly the same thing as the word doubt only with a different connotation.
Perhaps you just used it as a springboard to point out contradiction of certain beliefs with modern knowledge or perhaps it’s a bias against religion that you hold. If so, noted.
Such authority has an important societal role, and traditions are important for a lot of people.
Anybody who threatens regulation or upsetting the current order is, by his definition, the anti-christ. He doesn't need everybody to believe him. Just enough useful idiots.