The thing is, some atheists usually think they're a lot more smarter than believer because well, they don't believe in god. That's obnoxious and arrogant.
Just because you don't believe in a higher entity doesn't make you smarter. Of course there are dumb religious people and dumb atheists, buut I just hate the ones who think they're smarter and better "at life" (that goes for religious people too.)