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.
Minorities in Iraq
The majority of Kurds are Sunni Muslims, with Shia and Alevi Muslim minorities. There are also a significant number of adherents to native Kurdish/Iranian religions like Yarsanism. Some Kurdish Communists and Socialists are Atheist.