I think that is a bias and Eurocentric stereotype that you are pumping there that the only reason people in the global south are accepting Christianity is because of "fear of hell" or that some how they are just ignorant. Churches do a lot of social justice work in these areas that don't often get attention. 

In the Congo for instance the Catholic Church just played a major role in terms of peacemaking in that area. In South Sudan both the Anglican, Catholic and World Council of Churches are on the ground in terms of push peace and reconciliation and providing shelter for those experiencing violence. In these regions the Churches are some of the largest health care providers out there and they are often at the fore front of social justice issues from the environment, to poverty, to how migrants and refugees are treated. 

So people in the Global South obviously know about the abuses in Church history. You had decades of colonization. But they are still attracted to Jesus Christ.