Religion in Iraq
Islam is the official state religion in the Republic of Iraq, but the constitution guarantees freedom of religion. Iraq is a multi ethnic and multi religious country with Islam, Christianity, Yazdanism, Zoroastrianism, Shabakism, Judaism, Mandaeism, Bahā'i, Ahl-e Haqq-Yarsanis, Ishikism and numerous other religions all having a presence in the country. Shia Islam is the main religion in Iraq followed by 60–65% of the population, while Sunni Islam is followed by 32–37% of the people. Many cities throughout Iraq have been areas of historical prominence for both Shia and Sunni Muslims, including Najaf, Karbala, Baghdad and Samarra.
Sectarianism
Pakistan, one of the largest Muslim countries the world, has seen serious Shia-Sunni sectarian violence. Almost 80 - 85 
of Pakistan's Muslim population is Sunni, and another 10 - 20% are Shia. However, this Shia minority forms the second largest Shia population of any country, larger than the Shia majority in Iraq.