Religion in Nigeria (being the most populous African country with a population of over 225 million as of 2022) is diverse. The country is home to some of the world's largest Christian and Muslim populations, simultaneously. Nigeria is divided roughly in half between Muslims, who live mostly in the north, and Christians, who live mostly in the south; indigenous religions, such as those native to the Igbo and Yoruba ethnicities, are in the minority. The Christian share of Nigeria's population is on decline due to lower fertility rate compared to Muslims in the north. Most Nigerian Christians are Protestant (broadly defined), though about a quarter are Catholic. The majority of Nigerian Muslims are either Sunni or non-denominational Muslims. Many Sunni Muslims are members of Sufi brotherhoods or Tariqa. Most Sufis follow the Qadiriyya, Tijaniyyah or Mouride movement. A significant Shia minority also exists (see Shia in Nigeria). There are also Ahmadiyya and Mahdiyya minorities. In terms of Nigeria's major ethnic groups' religious affiliations, the Hausa ethnic group in the north is mostly Muslim the Yoruba tribe in the west is divided among mainly Muslims and Christians with many followers of traditional religions, while the Igbos of the east and the Ijaw in the south are predominantly Christians with some practitioners of traditional religions. The middle belt of Nigeria contains the most of the minority ethnic groups in Nigeria and they are mostly Christians and Christian converts, as well as members of traditional religions with few Muslim converts. Nigeria is officially a secular state with no official state religion. Article 10 of the Constitution states that “The Government of the Federation or of a State shall not adopt any religion as State Religion.” However, twelve Muslim-majority northern states have incorporated Sharia courts into their legal systems with the power and jurisdiction of these courts waxing and waning over the past two decades. In some of these states, sharia courts are optional arbitration courts for personal status issues where as in others, sharia has effectively replaced the formerly secular state level legal system in both civil and criminal contexts. This has brought controversy due its discriminatory practices towards religious and sexual minorities. Northern Nigeria has also been the site of ongoing Islamist insurgency which has led to the death and displacement of tens of thousands of people. Survey data Figures in the most recent edition of The World Christian Encyclopedia (Johnson and