The country has an area of 356,700 square miles and a population of 149 million. While some groups estimate the population to be 50 percent Muslim, 40 percent Christian, and 10 percent practitioners of indigenous religious beliefs, it is generally assumed that the proportions of citizens who practice Islam and citizens who practice Christianity are roughly equal and include a substantial number who practice indigenous religious beliefs alongside Christianity or Islam. The predominant form of Islam is Sunni; however, there is an emerging Shi'a minority. The Christian population includes Roman Catholics, Anglicans, Baptists, Methodists, Presbyterians, and a growing number of evangelical and Pentecostal Christians and members of The Church of Jesus Christ of Latter-day Saints (Mormons).
The north, dominated by the Hausa-Fulani and Kanuri ethnic groups, is predominantly Muslim. Significant Christian communities have resided and intermarried with Muslims in the north for more than 50 years, however. Both Muslims and Christians reside in large numbers in the Middle Belt, including the Federal Capital Territory (FCT). In the southwest, where the Yoruba ethnic group predominates, Christians and Muslims reside in equal numbers. While most Yorubas practice either Christianity or Islam, the practice of traditional Yoruba religious beliefs continues. Southern ethnic groups are predominantly Christian. In the east, where the Igbo ethnic group is dominant, Catholics, Anglicans, and Methodists are the majority, although many Igbos continue to observe traditional rites and ceremonies in tandem with Christianity. In the oil-rich and restive Niger Delta region, where the Ogoni and Ijaw ethnic groups prevail, Christians are the majority, with an estimated 1 percent of the population adhering to Islam. Members of the Ahmadiyya Movement maintain a presence in Lagos and Abuja.