Most people think their own group is superior, and that they themselves are superior to the rest of their group.

Christians are a very extreme exception, and religion remedied it almost immediately. Ironically Jews are often closer to Christian virtues than Christians anymore.

I will also say about Jews, most of them align more with Christian values than you'd expect. They're more willing than most Christian churches to accept that their scripture might not be 100% literal all the time, or even that it may have been altered over the millenia. So when one of their laws says to treat the foreigner exactly like a native, while another says goyim are subhuman, they're willing to acknowledge that there's a problem. But the exception is also the most recognized form of Judaism: the ultra-orthodox. They are the modern-day descendants of the Pharisees, who hold to a very strict, literal, and legalistic interpretation. These are the ones who think goyim only exist to serve Jews etc.