, Ifugao , Itbayat , Ivatan , Kalinga , Kamayo , Kankana-ey , Kinaray-a , Maguindanao , Maranao , Masbatenyo , Romblomanon , Surigaonon , Tausug , Yakan , and several Visayan languages are prevalent in their respective provinces. Religion Dominant religion by province , Christianity (blue) and Islam (green). Main