At the 2011 division which split off South Sudan, over 97% of the population in the remaining Sudan adheres to Islam. Most Muslims are divided between two groups: Sufi and Salafi (Ansar Al Sunnah) Muslims. Two popular divisions of Sufism, the Ansar and the Khatmia, are associated with the opposition Umma and Democratic Unionist parties, respectively. Only the Darfur region has traditionally been bereft of the Sufi brotherhoods common in the rest of the country.
Significant, long-established groups of Coptic Orthodox and Greek Orthodox Christians exist in Khartoum and other northern cities. Ethiopian and Eritrean Orthodox communities also exist in Khartoum and eastern Sudan, largely made up of refugees and migrants from the past few decades. The largest groups affiliated with Western Christian denominations are Roman Catholic and Anglican. Other Christian groups with smaller followings in the country include the Africa Inland Church, the Armenian Apostolic Church, the Sudan Church of Christ, the Sudan Interior Church, Jehovah’s Witnesses, the Sudan Pentecostal Church, the Sudan Evangelical Presbyterian Church (in the North).
Religious identity plays a role in the country’s political divisions. Northern and western Muslims have dominated the country’s political and economic system since independence. The NCP draws much of its support from Islamists, Salafis/Wahhabis and other conservative Arab Muslims in the north. The Umma Party has traditionally attracted Arab followers of the Ansar sect of Sufism as well as non-Arab Muslims from Darfur and Kordofan. The Democratic Unionist Party (DUP) includes both Arab and non-Arab Muslims in the north and east, especially those in the Khatmia Sufi sect.