About 50% of the Congolese population is Christian, predominantly Roman Catholic. Most of the non-Christians adhere to either traditional religions or syncretic sects. Traditional religions include concepts such as monotheism, animism, vitalism, spirit and ancestor worship, witchcraft, and sorcery and vary widely among ethnic groups; none is formalized. The syncretic sects often merge Christianity with traditional beliefs and rituals. The most popular of these sects, Kimbanguism, was seen as a threat to the colonial regime and was banned by the Belgians. Kimbanguism, officially "the church of Christ on Earth by the prophet Simon Kimbangu," now claims about 3 million members, primarily among the Bakongo tribe of Bas-Congo and Kinshasa. In 1969, it was the first independent African church admitted to the World Council of Churches.

Before independence, education was largely in the hands of religious groups. The primary school system was well developed at independence; however, the secondary school system was limited, and higher education was almost nonexistent in most regions of the country. The principal objective of this system was to train low-level administrators and clerks. Since independence, efforts have been made to increase access to education, and secondary and higher education have been made available to many more Congolese. According to estimates made in 2000, 41.7% of the population has no schooling, 42.2% has primary schooling, 15.4% has secondary schooling, and 0.7% has university schooling. At all levels of education, males greatly outnumber females. The largest state-run universities are the University of Kinshasa, the University of Lubumbashi, and the University of Kisangani. The elite continue to send their children abroad to be educated, primarily in Western Europe.