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 Islam in Iraq
Shia (; ) Muslims make up the majority of the Iraqi population, with 64 to 69 percent of Iraqis identifying as Shia. Shia Islam has a long history in Iraq; the fourth caliph of Sunni Islam and the first Imam of Shia Islam, Ali ibn Abi Talib, moved the capital of the empire from Medina to Kufa (or Najaf) two decades after the death of Muhammad.