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.
Christianity in Algeria
After Algeria became independent in 1962, about 800,000 "Pieds-Noirs" of French nationality were evacuated to European France. The majority of those who evacuated were Christian or Jewish. Approximately 200,000 Algerian inhabitants of French nationality chose to remain in Algeria. The number of people with French nationality has continued to decrease over the decades. There were approximately 100,000 in 1965 and about 50,000 by the end of the 1960s.