In the early 1990s, official records of Sudan as a whole (Sudan and South Sudan) showed that a large percentage adhered to African Traditional Religion (17%) and Christianity (8%) (though both located mainly in the south, some also at Khartoum). Among Christians, most are Catholic and Anglican, though other denominations are also active, and African Traditional Religion beliefs are often blended with Christian beliefs.
The most recent Pew Research Center on Religion and Public Life report from December 2012 estimated that in 2010, there were 6.010 million Christians (60.46%), 3.270 million followers of African Traditional Religion (32.9%), 610,000 Muslims (6.2%) and 50,000 unaffiliated (no known religion) of a total 9,940,000 people in South Sudan.
These figures are also disputed as the Pew Research Center on Religion and Public Life report cites 'The United Nations provided the Pew Forum with special estimates for Sudan and the new nation of South Sudan'. The UN does not have any official figures on ethnicity & religion outside National Census figures.