The U.S. government estimates the total population at 926,000 (July 2018 estimate).  According to the 2007 census, approximately 64.5 percent of the population is Christian, 28 percent Hindu, and 6.3 percent Muslim.  The largest Christian denomination is the Methodist Church.  Other Protestant denominations account for 10.4 percent of the population, Roman Catholics 9.1 percent, and other Christian groups 10.4 percent.  There are small communities of Baha’is, Sikhs, and Jews.

Religious affiliation runs largely along ethnic lines.  According to the 2007 census, most iTaukei (indigenous Fijian) citizens, who constitute 57 percent of the population, are Christian.  The majority of the country’s traditional chiefs belong to the Methodist Church, which remains influential among indigenous people, particularly in rural areas where 49 percent of the population lives.  Most Indian Fijians, who account for 37 percent of the total population, are Hindu, while an estimated 20 percent are Muslim and 6 percent Christian.  Approximately 60 percent of the small Chinese community is Christian.  The small community of mixed European and Fijian ancestry is predominantly Christian.

The U.S. government estimates the total population at 109,000 (July 2018 estimate).  According to the 2015 census, approximately 57 percent of the population is Roman Catholic and 31 percent belongs to the Kiribati Uniting Church (until 2016 known as the Kiribati Protestant Church).  Members who did not accept the 2016 name change continue as the Kiribati Protestant Church.  Five percent of the population belongs to the Church of Jesus Christ.  Groups that together constitute less than 5 percent of the population include the Baha’i Faith (2 percent), Seventh-day Adventist Church (2 percent), Jehovah’s Witnesses, Assemblies of God, and Muslims.  The Church of Jesus Christ states its membership exceeds 12 percent of the population.  Persons with no religious affiliation account for less than 1 percent of the population.  Members of the Catholic Church are concentrated in the northern islands, while Protestants constitute the majority in the southern islands.

The U.S. government estimates the total population at 10,000 (July 2018 estimate).  According to the 2011 national census, approximately 95 percent of the population is Christian.  The Nauru Congregational Church (which includes the Nauru Protestant Church) is the largest Christian group, constituting 36 percent of the population, followed by the Roman Catholic Church at 33 percent, the Nauru Independent Assembly of God at 13 percent, and the Nauru Independent Church at 10 percent.  Jehovah’s Witnesses, Seventh-day Adventists, Baptists, and The Church of Jesus Christ of Latter-day Saints each constitute less than 1 percent of the population.  Two percent of the population reported no religious affiliation.  Ethnic Chinese residents, estimated to constitute 5 percent of the population, are Confucian, Buddhist, Taoist, Christian, or nonreligious.  In addition, according to several nongovernmental organizations and the Australian government, approximately 1,000 persons fleeing their home countries lived in Nauru through much of the year, although many reportedly left the country temporarily for medical reasons toward the end of the year.  Most of those coming to Nauru were from Muslim majority countries, and many were Christian.