It has approximately 1,000,000 members and 500 congregations in Southern Sudan.
They started churches in the southern part of the country, in Dolleib Hill and the first pastor is Rev/ Laa Amoleker from Dolleib Hill,in 1902 leaving the northern congregations to Egyiptian evangelicals.
By 1945 schools and mission work were organised in Malakal, Wauglel, Obel, Bor and elsewhere.
[3] It is the third largest denomination in Sudan after the Episcopal and the Roman Catholic Church.
[8] It is a member of the World Communion of Reformed Churches.