Religion in Iraq
Islam is the official state religion in the Republic of Iraq, but the constitution guarantees freedom of religion. Iraq is a multi ethnic and multi religious country with Islam, Christianity, Yazdanism, Zoroastrianism, Shabakism, Judaism, Mandaeism, Bahā'i, Ahl-e Haqq-Yarsanis, Ishikism and numerous other religions all having a presence in the country. Shia Islam is the main religion in Iraq followed by 60–65% of the population, while Sunni Islam is followed by 32–37% of the people. Many cities throughout Iraq have been areas of historical prominence for both Shia and Sunni Muslims, including Najaf, Karbala, Baghdad and Samarra.
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?