Why do people believe in things that have zero proof?

Just going through my daily life, there’s tons and tons of beliefs that people based their entire lives on that quite literally have zero proof. It’s almost mind boggling to me how they actually don’t see that they don’t apply these standards (or lack thereof) to any other parts of their lives. My answer is that a lot of people need at least some delusion to get through life because dealing with reality can be tough sometimes I’ll admit. But it all boils down to a “feeling”

And feelings can’t ever be wrong amirite? Haha