antivaxers, many political beliefs, and many other things that we "know" are absolutely true, but cannot prove.
Even science itself. How many people who claim science is all actually understand the equations of string theory, or have actually worked with genetics? And exactly how do those nitrites in processed meat interfere with our body's natural defenses?
When buying "gluten free", who actually knows what gluten is or why it is bad? Or if it's really bad anyway? And just how many steps a day should you be walking?
It's easy to ridicule many beliefs, but not so easy when you have to put your own to the same standards.
Our lives depend on trust and belief in this complex modern world, just as it did in simpler times. And our myths and beliefs change with the times. Most Christians and Jews have come to the understanding that the history in the Bible is neither history nor science, but illustrates principles and ethics that underlie the religions. I even hear that for years Yale Divinity School has not required a belief in God in order to get that Divinity degree.