There's a significant difference between believing there is no god(Atheism is not just not believing) and believing that someone is foolish or idiotic for believing otherwise.
that is not a "hardcore" version of atheism. atheism just means you do not believe in god. if you have a problem with people who think they are superior to religious people, just say you don't like people who think they are superior because of religious/lack of religious beliefs, which also includes many religious people (who think they are superior to others who do not share their beliefs they think are correct)
btw religious people are all delusional or simple
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I'm "kind of a big deal".
http://img.imgcake.com/cyclo/Cyclopngegpngre.png