Other than the island of Bali, they are all Muslims.
Radicalization of Indonesia began about 40 years ago.
Indonesia is about 10 percent non-Muslim, Christians, Hindus and Buddhists can be found throughout the country and not just Bali.
And Indonesia is probably one of the least radicalised Muslim country in the world. There are far more British, French, and even US citizens fighting for ISIS than there are Indonesians.