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.
Demographics of Yemen
Religion in Yemen consists primarily of two principal Islamic religious groups: 53% of the Muslim population is Sunni and over 45% is Shia, according to the UNHCR. Other put the numbers of Shias at 30%. Sunnis primarily adhere to the Shafi'i school, and there are also significant followers of the Maliki and Hanbali schools. Shias are primarily Zaidi and also have significant minorities of Twelver and Ismaili Shias.