Demographics of Iraq
97% of Iraqis follow Islam: 61% Shia and 34% Sunni. 1% of these describe themselves as "Just a Muslim". According to the CIA Factbook, Shias make up 60% of population, while Sunnis 35%. Christianity accounts for 5%, and the rest practice Mandaeism, Yazidism and other religions.
Shia–Sunni relations
According to Shia rights watch, in 2014 ISIS forces killed over 1,700 Shia civilians at Camp Speicher in Tikrit Iraq, and 670 Shia prisoners at the detention facility on the outskirts of Mosul. In June 2014, the New York Times wrote that as ISIS has "seized vast territories" in western and northern Iraq, there have been "frequent accounts of fighters’ capturing groups of people and releasing the Sunnis while the Shiites are singled out for execution". The report listed questions ISIS uses to "tell whether a person is a Sunni or a Shiite"—What is your name? Where do you live? How do you pray? What kind of music do you listen to?