Bangladesh followed by 86.6 percent of the population. The country is home to most Bengali Muslims, the second-largest ethnic group in the Muslim world. Most Bangladeshi Muslims are Sunni, followed by Shia and Ahmadiya. About four percent are non-denominational Muslims. Bangladesh has the fourth-largest Muslim population in the world, and is the third-largest Muslim-majority country (after Indonesia and Pakistan). Sufism has a lengthy heritage in the region. The largest gathering of Muslims in Bangladesh is the Bishwa Ijtema, held annually by the Tablighi Jamaat. The Ijtema is the second-largest Muslim congregation in the world, after the Hajj. Hinduism is followed by
Muslim world and African American Muslims later emerged independently. According to the UNHCR, Muslim-majority countries hosted 18 million refugees by the end of 2010. Since then Muslim nations have absorbed refugees from recent conflicts, including the uprising in Syria. In July 2013, the UN stated that the number of Syrian refugees had exceeded 1.8 million. In some Muslim-majority countries, illiteracy is a problem, whereas in others literacy rates are high. In Egypt, the largest Muslim-majority Arab country, the youth female literacy rate exceeds that for males. Lower literacy rates are more prevalent in South Asian countries such as in Afghanistan and Pakistan,