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.
Islam in Syria
In 1973 Professor Moshe Ma'oz said that the non-Arabic-speaking Sunni Muslim Kurds formed 8.3% of the population. By 1979 Dr. Nikolaos van Dam claimed that the Syrian Kurds (forming 8.5% of the population at the time) were almost exclusively Sunni Muslims. Dr Henry Munson said that Sunni Muslim Kurds formed 9% of the population in 1988, whilst Professor Alasdair Drysdale and Professor Raymond Hinnebusch said that they formed 8.5% in 1991. In recent decades, the population of other religious minorities (particularly Christians and Jews) has decreased, therefore, estimates on the proportion of Sunni Kurds has increased. For example, Dr. Pierre Beckouche has said that before 2011 the Sunni Muslim Kurds formed 9-10% of the country's total population.