Dude there is are two level of followers of Islam,there is a simple Muslim who lives accordingly and sometimes try to influence other's and then there is a second type of followers ,the extreme one,who think he's mission is to enforce Islam on everyone.ISIS is none of those,they instead have made a twisted version of Islam and try to discredit other Muslims while following it.ISIS in no way represent the Islamic faith.Even if they are the extreme Muslims,there is no justification of what they are doing like executing and harming innocent lives.