Religion in Iraq
Iraq's Muslims follow two distinct traditions, Shia and Sunni Islam. According to the 2018 "CIA Factbook", Iraq is 95% Muslim: 64–69% Shia (Arabs, Feyli Kurds et al.) and 29–34% Sunni (Arabs and Kurds). The overall percentage of Muslims has increased since the Iraqi Civil War (2014–2017) due to the migration of Christian and Yezidi refugees into neighboring countries. A 2011 Pew Research Center Survey found that Iraqi Muslims are 51% Shia, 42% Sunni, and 5% described themselves as "Just a Muslim". Iraq is home to many religious sites important for both Shia and Sunni Muslims. Baghdad was a hub of Islamic learning and scholarship for centuries and served as the capital of the Abassids. The city of Karbala has substantial prominence in Shia Islam as a result of the Battle of Karbala, fought on the site of the modern city on October 10, 680. Similarly, Najaf is renowned as the site of the tomb of Alī ibn Abī Tālib (also known as "Imām Alī"), whom the Shia consider to be the righteous caliph and first imām. The city is now a great center of pilgrimage from throughout the Shi'a Islamic world and it is estimated that only Mecca and Medina receive more Muslim pilgrims. The city of Kufa was home to the famed Sunni scholar Abu Hanifah, whose school of thought is followed by a sizable number of Sunni Muslims across the globe. Likewise, Samarra is also home to the al-Askari Mosque, containing the mausoleums of the Ali al-Hadi and Hasan al-Askari, the tenth and eleventh Shia Imams, respectively, as well as the shrine of Muhammad al-Mahdi, known as the "Hidden Imam", who is the twelfth and final Imam of the Shia of the Ja'farī Madhhab. This has made it an important pilgrimage centre for Ja'farī Shia Muslims. In addition, some female relatives of the Prophet Mohammad are buried in Samarra, making the city one of the most significant sites of worship for Shia and a venerated location for Sunni Muslims.
Syria
Sunni Muslims make up between 69–74% of Syria's population and Sunni Arabs account for 59–60% of the population. Most Kurds (8.5%) and most Turkoman (3%) are Sunni and account for the difference between Sunnis and Sunni Arabs, while 13% of Syrians are Shia Muslims (particularly Alawite, Twelvers, and Ismailis but there are also Arabs, Kurds and Turkoman), 10% Christian (the majority are Antiochian Greek Orthodox, the rest are Syrian Orthodox, Greek Catholic and other Catholic Rites, Assyrian Church of the East, Armenian Orthodox, Protestants and other denominations), and 3% Druze. Druze number around 500,000, and concentrate mainly in the southern area of Jabal al-Druze.