Your goal is to get Mindano and every non-Christian region of the Philippines to convert to Christianity.
The Majority of Mindanao is Christian now. In fact, it's only a few provinces that are Muslim. Lanao, Sulu, Tawi Tawi, and a few others are majority Muslim. In fact, according to wikipedia, 70% of Mindanao is Christian. Look at this link on majority religions in Mindanao.
http://en.wikipedia.org/wiki/Religion_in_the_Philippines
The number of muslim provinces could be counted in both hands.