Why do people still believe in so-called gods when they know they are made up?

In the modern world, those who truly believe that God exists are the ones who are out of their minds. The vast majority of so-called believers are really just religions that fulfill their needs. For example, socialization needs. A bunch of old people getting together to yakkety-yak is annoying, but it's also obvious that they're very energized. In fact, just like the old men on the hill who gather every day to talk about the world situation, they are just lonely and need someone to talk with. Older people congregate to go to church, gathering to burn incense, in fact, and older people congregate to dance in the square is no different.