Islam is the largest religion in Sierra Leone, with significant Christian and animist minorities. According to a 2015 estimate from the Pew Research Centre, 78.0% of the population is Muslim, 20.9% is Christian, while the rest of the population is either animist or follows other religious beliefs. While this estimate is based on census data, a similar estimate was derived from a recent major household survey: in the 2013 Demographic and Health Survey, 78.2% of respondents were Muslim and 21.2% Christian.
Other sources give different estimates. Muslims are estimated to comprise 60% of Sierra Leone's population according to the US Department of State, while 20 to 30% are reported to be followers of Christianity, and 5 to 10% of the population practice indigenous animist beliefs.
The 2007 UNHCR's "Report on International Religious Freedom in Sierra Leone" estimated 55% Muslim, 40% Christian and 5% other beliefs, with many citizens practising a mixture of Islam and traditional indigenous religious beliefs or Christianity and traditional indigenous beliefs.
Muslims predominate in all of the country's three provinces and the Western Area, though formerly they were concentrated in the north with the south being mainly Christian.
The vast majority of Sierra Leonean Christians are Protestants with biggest groups being Methodists and various Evangelical Protestants. Other Protestant denominations in the country include Presbyterians,Baptists,Seventh-day Adventists and Lutherans.
The constitution of Sierra Leone provides for freedom of religion and the government generally protects this right and does not tolerate its abuse.