Sunni's equate to 90% of the Islamic population, while Shia's make up about the other 10%. ISIS is Sunni. Shia's are considered extreme Islam. But Shia's are fighting the Sunni's, so we like them. Shia's views on Islam are more pure, believing that only the blood line of Muhammed are fit to be rulers or leaders in the Islamic faith. Sunni's believe that anyone can be a leader in the faith.