The U.S. government estimates the total population at 16.9 million (July 2020 estimate). According to a 2014-2015 census estimate, 52.1 percent of the population is Muslim, 23.9 percent Protestant, 20 percent Roman Catholic, 0.3 percent animist, 0.2 percent other Christian, 2.8 percent no religion, and 0.7 percent unspecified. Most Muslims adhere to the Sufi Tijaniyah tradition. A small minority hold beliefs associated with Wahhabism, Salafism, or follow the political-religious doctrine espoused by the Muslim Brotherhood. Most Protestants are evangelical Christians. There are small numbers of Baha’is and Jehovah’s Witnesses.

Most northerners practice Islam, and most southerners practice Christianity or indigenous religions. There is a significant Muslim presence in the south but minimal Christian presence in the north. Religious distribution is mixed in urban areas, and indigenous religions are often practiced to some degree along with Islam and Christianity.

The U.S. government estimates the total population at 22.8 million (midyear 2020 estimate). According to the Ministry of Interior, more than 98 percent of the population is Muslim. Of the Muslim population, the great majority is Sunni and less than 7 percent is Shia. Roman Catholics, Protestants, and other religious groups account for less than 2 percent of the population. There are several thousand Baha’is, who reside primarily in Niamey and in communities on the west side of the Niger River. A small percentage of the population adheres primarily to indigenous religious beliefs. Some Muslims intermingle animist practices with their practice of Islam, although observers note this has become less common over the past decade.