the south are also prone to instances of political violence based on religious beliefs, as this is where the non-Hausa Christian minorities reside that are disfavored by the predominantly Hausa Muslim government. Non-Hausa groups residing in southern regions of Nigeria are marginalized by the republic, treated as second-class citizens, and denied their entitlements. The Zango Kataf riot of 1992 is one example of political violence in the south; when the local government announced markets would be moved out of southern Zango, riots erupted and thousands of people were killed as this was yet another instance of governmental discrimination that displaced the predominantly Christian locals. The majority of Christians now are found in the south east, South-South, south west and Middle-belt region. It is estimated that around half the Nigerian population today are Muslim, while just under half are Christian. In northern urban centers, however, about 95% of the population is Muslim. An increasing number of mission stations and mission bookstores, along with churches serving southern enclaves and northern Christians in the northern cities and larger towns, are found in the Muslim north. Christianity in Yoruba area traditionally has been Protestant and Anglican, currently Protestant Pentecostal/evangelicals, whereas Igboland has always been the area of greatest activity by the Roman Catholic Church with current infusions of Protestantism. Other denominations abounded as well. Presbyterians arrived in the late 17th century in the Ibibio, Annang and Efik land and the Niger Delta area and had missions in the middle belt as well. The works of the Presbyterian Church in Calabar from Scotland by missionaries like Rev Hope M. Waddell, who arrived in Calabar 10 April 1846, in the 19th century and that of Mary Slessor of Calabar are examples. Small missionary movements were allowed to start up, generally in the 1920s, after the middle belt was considered pacified. Each denomination set up rural networks by providing schooling and health facilities. Most such facilities remained in 1990, although in many cases schools had been taken over by the local state government in order to standardize curricula and indigenize the teaching staff. Pentecostals arrived mostly as indigenous workers in the post-independence period, and in the 1980s, Evangelical and Apostolic Pentecostalism were spreading rapidly throughout the south western and middle belt, having major success in hitherto Roman Catholic and Protestant towns of the south as well . There were also breakaway, or Africanized churches, that blended traditional