Religion in South Sudan by the 2012 Pew Research on Religion Note that other sources give differing figures.
There are conflicting reports as to the religious beliefs in South Sudan, though all agree that the three main religions are African Traditional Religion, Christianity and Islam. The South Sudanese President Kiir, a Roman Catholic, while speaking at Saint Theresa Cathedral in Juba, South Sudan, stated that South Sudan would be a nation which respects freedom of religion. The reported estimated relative proportions of adherents of African Traditional Religion and Christianity have varied.
In 1920, the Church Missionary Society originated a Diocese which expanded to form Lui, South Sudan.
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.
In addition to news sources, the Anglican and Catholic churches claim large membership. The US Episcopal Church claimed 2 million members in 2005 in the Episcopal Church of the Sudan.