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 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.