Answer:
They consist of the various ethno-linguistic groups that are not Muslim, e.g., the Ata, Bagobo, Mamanua, Mandaya, Kamayo, Mangguwangan, Manobo, Mansaka, Matigsalog, Subanun, Tagakaolo, Tala-andig, T'boli, Tiruray and Ubo. Many of these groups are Christianized or partly Christianized, and some are partly Islamicized.
