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.
Nineveh Governorate
In religion, the majority are Sunni Muslim. 80% of Arabs are Sunni Muslim, the majority of Turkmens are Sunni Muslim, Kurds are mostly Sunni Muslim, and about 5-10% of the population is Christian and mostly followers of Yazidis, Shabaks and Mandeans follow their own religious beliefs: Yazidism, Shabakism, and Mandaeism.