Islam is the predominant religion in Algeria, with its adherents, mostly Sunnis, accounting for 99% of the population according to a 2021 CIA World Factbook estimate, and 97.9% according to Pew Research in 2020.
ɪslˈɑːm ɪz ðə pɹɪdˈɑːmɪnənt ɹᵻlˈɪdʒən ɪn ældʒˈɪɹiə, wɪð ɪts ɐdhˈɪɹənts, mˈoʊstli sˈʌniz, ɐkˈaʊntɪŋ fɔːɹ nˈaɪnti nˈaɪn pɚsˈɛnt ʌvðə pˌɑːpjʊlˈeɪʃən ɐkˈoːɹdɪŋ tʊ ɐ tˈuː θˈaʊzənd twˈɛnti wˈʌn sˌiːˌaɪˈeɪ wˈɜːld fˈæktbʊk ˈɛstᵻmət, ænd nˈaɪnti sˈɛvən.nˈaɪn pɚsˈɛnt ɐkˈoːɹdɪŋ tə pjˈuː ɹᵻsˈɜːtʃ ɪn tˈuː θˈaʊzənd twˈɛnti.