Algeria
Islam is the predominant religion in Algeria, with its adherents, mostly Sunnis, accounting for 99% of the population according to a 2012 CIA World Factbook estimate, and 97.9% according to Pew Research in 2010. There are about 150,000 Ibadis in the M'zab Valley in the region of Ghardaia.
Freedom of religion in Algeria
People without religious affiliation tend to be particularly numerous in Kabylie (a Kabyle-speaking area) where they are generally tolerated and sometimes supported; notably, Matoub Lounes is widely seen as a hero among Kabyles, despite (or because of) his lack of religion. In most other areas of the country, the non-religious tend to be more discreet.