They are a group that represents an interpretation of Islam. They do not represent all Muslims, or all interpretations of Islam as a whole. Just like the Westboro Baptist Church is a crazy offshoot of xianity, or really any fundamentalists of any religion... They represent their brand of that religion.
There are even fundamentalist Buddhists in Myanmar! No one would claim they represent all Buddhists, but they do represent their own brand of the religion. It just happens to be insane.
ISIS has been found by America and Israel. They just want to stop Islamic awakening and replace it with islamphobia.
TERRORISM HAS NO RELIGION.
Unluckily, the people in the west see Islam as a religion of violence, hate, and terror. But that is completely wrong. If you really think about it 1.6 billion Muslims around the world are following the religion of violence, hate and terror. Do you really think that? Do you really believe that?
Many non-Muslims with knowledge or without knowledge, claims that Quran/Islam orders Muslims to kill disbelievers and who refuse to embrace Islam. This is false, Quran/Islam actually says that "If anyone slew an innocent person it would be as if he slew the whole mankind and if anyone saved a life it would be as if he saved the life of the whole mankind " Quran chapter 5 verse 32.
Islam is a religion of peace, love and compassion like any other religion.
I wish people could look back and understand before blaming Islam and Muslims for everything.