The U.S. government estimates the total population at 42.3 million (midyear 2019 estimate), more than 99 percent of whom are Sunni Muslims following the Maliki school. Religious groups together constituting less than 1 percent of the population include Christians, Jews, Ahmadi Muslims, Shia Muslims, and a community of Ibadi Muslims residing principally in the province of Ghardaia. Some religious leaders estimate there are fewer than 200 Jews.

The Christian community includes Roman Catholics, Seventh-day Adventists, Methodists, members of the Protestant Church of Algeria (EPA), Lutherans, the Reformed Church, Anglicans, and an estimated 1,000 Egyptian Coptic Christians. Religious leaders’ unofficial estimates of the number of Christians range from 20,000 to 200,000. According to the Christian advocacy nonprofit organization Open Doors USA, there are approximately 125,000 Christians. According to government officials and religious leaders, foreign residents make up most of the Christian population. Among the Christian population, the proportion of students and immigrants from sub-Saharan Africa without legal status has also increased in recent years. Christian leaders say citizens who are Christians predominantly belong to Protestant groups.

Christians reside mostly in Algiers, the Kabilye region in Bejaia, and the provinces of Tizi Ouzou, Annaba, Ouargla, and Oran.