Tanzania's population consists of approximately 62% Christians, 35% Muslims, and 3% followers of indigenous religions. The CIA World Factbook however states that 30% of the population is Christian with Muslim being 35% and indigenous beliefs 35%.
The national census, however, has not asked for religious affiliation since 1967 as the religious balance is seen as a sensitive topic. As Tanzanians pride themselves on living together with their diversity, the use of a statistic that is conveniently equal is seen as avoiding rivalries between the various religious groups by not identifying the majority. All figures on religious statistics for Tanzania are at best educated guesswork and differ widely on the question whether there are more Christians or Muslims. Most assume that the share of traditionalists has dwindled.
The Christian population is mostly composed of Roman Catholics. Among Protestants the strong numbers of Lutherans and Moravians point to the German past of the country, the numbers of Anglicans to the British history of Tanganyika. All of them have had some influence in varying degrees from the Walokole movement (East African Revival) which has also been fertile ground for the spread of charismatic and Pentecostal groups. Zanzibar is about 97% Muslim. On the mainland, Muslim communities are concentrated in coastal areas, with some large Muslim majorities also in inland urban areas especially and along the former caravan routes. A large majority of the Muslim population is Sunni. The Islamic population of Dar es Salaam, the largest and richest city in Tanzania, is composed of mainly Sunni Muslims.
There are also active communities of other religious groups, primarily on the mainland, such as Buddhists, Hindus, and Bahá'ís
