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.
Karachi
Karachi is overwhelmingly Muslim, though the city is one of Pakistan's most secular cities. Approximately 65% of Karachi's Muslims are Sunnis, while 35% are Shi'ites. Sunnis primarily follow the Hanafi school of jurisprudence, with Sufism influencing religious practices by encouraging reverence for Sufi saints such as Abdullah Shah Ghazi and Mewa Shah. Shi'ites are predominantly Twelver, with a significant Ismaili minority which is further subdivided into Nizaris, Mustaalis, Dawoodi Bohras, and Sulaymanis.