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.
Persecution of minority Muslim groups
Some of the worst Shia-Sunni sectarian strife has occurred after the American invasion of Iraq, steadily building up to present. According to one estimate, as of early 2008, 1,121 Muslim suicide bombers have blown themselves up in Iraq. Sunni suicide bombers have targeted not only thousands of civilians, but mosques, shrines, wedding and funeral processions, markets, hospitals, offices, and streets. On the Shia side, in early February 2006 militia-dominated government death squads were reportedly "tortur[ing] to death or summarily" executing "hundreds" of Sunnis "every month in Baghdad alone," many arrested at random.