The country has an area of 225,000 square miles and a population of 39 million. Approximately 80 percent of the population is Christian, 10 percent Muslim, less than 1 percent Hindu, Sikh, and Baha'i, while the remainder follows various indigenous religions. Protestants comprise 58 percent of Christians, and Roman Catholics 42 percent.
North Eastern Province, where the population is predominantly ethnic Somali, is home to 15 percent of the Muslim population. Sixty percent of the Muslim population lives in eastern Coast Province, making up 50 percent of the total population there. Western areas of Coast Province are mostly Christian. The upper part of Eastern Province is home to 10 percent of the country's Muslims, mostly ethnic Borana but also some Somalis, where they are the majority religious group. Apart from a small ethnic Somali Muslim population in Nairobi, the rest of the country is largely Christian.
Upper Eastern, North Eastern, and Coast Provinces, which together are home to approximately 75 percent of the Muslim population, are less developed than other parts of the country.