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.
Baghdad
Baghdad's population was estimated at 7.22 million in 2015. The city historically had a predominantly Sunni population, but by the early 21st century around 82% of the city's population were Iraqi Shia. At the beginning of the 21st century, some 1.5 million people migrated to Baghdad, most of them Shiites and a few Sunnis.Sunni muslims make up 30-35% of Iraq's population and they still majority in west and north Iraq.