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.
Culture of Iran
Today of the 98% of Muslims living in Iran, around 89% are Shi'a and only around 9% are Sunni.This is quite the opposite trend of the percentage distribution of Shi'a to Sunni Islam followers in the rest of the Muslim population from state to state (primarily in the Middle East) and throughout the rest of the world. This data is from the government of Iran and most likely contains false information. It is very likely that the percentage of Muslims living in Iran is highly exaggerated as Islam is forced under the Islamic Republic's sharia law.