It's just the human way to think that their way is better than any other. That's because they chose their path and they obviously thought it was the best choice. It's not just non-believers, by the way. It's everywhere and in everything, and believers do it just as often as anyone else. These people truly believe that intellect IS superior to faith, because if they didn't, they would be believers. Who is to say that they're wrong and who's to say that they're right. I'm not, but I know that other people express their opinions more freely than I do.