This is thought to have been a result of perpetual rainfall in the northern part of the province, KwaZulu-Natal Emergency Medical Services spokesperson Robert McKenzie said.
Tragedy struck while a Passover service was underway, also resulting in six people sustaining serious injuries and 10 minor injuries, he said.
Provincial police spokesperson Colonel Thembeka Mbele said the area experienced a storm and heavy winds which are believed to have resulted in the incident.
Police were still at the scene and a total of 29 people have been transported to hospital, she told News24.
According to her information, people had been sleeping in the church when the walls collapsed.
Provincial Disaster Management Centre officials were expected to accompany Cooperative Governance and Traditional Affairs MEC Nomusa Dube-Ncube to the site early on Good Friday to plan possible support for the bereaved families.