According to a 2010 estimates by the Pew Research Center 78% of Sierra Leone's population are Muslims (mostly Sunni), 20.9 are Christians (mostly Protestants) and 1% belong to a traditional African religion or other beliefs. The Inter-Religious Council of Sierra Leone estimated that 77% of Sierra Leone's population are Muslims, 21% are Christians, and 2% are followers of traditional African religion. Most of Sierra Leone's ethnic groups are Muslim majority, including the country's two largest ethnic groups: the Mende and Temne.