Christianity and colonialism are often closely associated with each other due to the service of Christianity, in its various sects (namely Protestantism, Catholicism and Orthodoxy), as the state religion of the historical European colonial powers, in which Christians likewise made up the majority. Through a variety of methods, Christian missionaries acted as the "religious arms" of the imperialist powers of Europe. According to Edward E. Andrews, Associate Professor of Providence College Christian missionaries were initially portrayed as "visible saints, exemplars of ideal piety in a sea of persistent savagery". However, by the time the colonial era drew to a close in the later half of the 20th century, missionaries were viewed as "ideological shock troops for colonial invasion whose zealotry blinded them", colonialism's "agent, scribe and moral alibi". In some regions, almost all of a colony's population was forcibly turned away from its traditional belief systems and forcibly turned towards the Christian faith, which colonizers used as a justification for their extermination of adherents of other faiths, their enslavement of natives, and their exploitation of lands and seas. Christianity is targeted by critics of colonialism because the tenets of the religion were used to justify the actions of the colonists. For example, Toyin Falola asserts that there were some missionaries who believed that "the agenda of colonialism in Africa was similar to that of Christianity". Falola cites Jan H. Boer of the Sudan United Mission as saying, "Colonialism is a form of imperialism based on a divine mandate and designed to bring liberation – spiritual, cultural, economic and political – by sharing the blessings of the Christ-inspired civilization of the West with a people suffering under satanic oppression, ignorance and disease, effected by a combination of political, economic and religious forces that cooperate under a regime seeking the benefit of both ruler and ruled." Edward Andrews writes: Historians have traditionally looked at Christian missionaries in one of two ways.