s are Christians (and also animists), so no matter how one divides it, it would never be able to be predominantly Muslim. The Muslims living there are mostly from other places in Indonesia
. The reason why Irian Jaya was divided into 3 provinces, is totally political, as the Jakarta government wanted to counteract the fact that Irian Jaya had become an autonomy. Irian Jaya, as it was, used to be Indonesia's richest province, but all the wealth was taken to the central government in Jakarta.