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 The Organisation of Islamic Cooperation (OIC) is an inter-governmental organization grouping fifty-seven states. 49 are Muslim-majority countries, the others have significant Muslim minorities. The organization claims to be the collective voice of the Muslim world to safeguard the interest and ensure the progress and well-being of their peoples and those of other Muslims in the world over. Muslim world The terms Muslim world and Islamic world commonly refer to the unified Islamic community (Ummah), consisting of all those who adhere to the religion of Islam, or to societies where Islam is practiced. In a modern geopolitical sense, these terms refer