According to Wikipedia, Indonesian identity card includes religion of the person:

The card requires identification with one of the six officially recognised religions in Indonesia: Islam, Protestantism, Catholicism, Hinduism, Buddhism and Confucianism

Indeed the main Christian religions within Indonesia are Protestantism and Roman Catholicism, but there is also a Christian group that belongs to Indonesia Orthodox Church

Question: Why Indonesian identity card religion does not include Orthodox as a possible religion?

According to Wikipedia, Indonesian identity card includes religion of the person:

The card requires identification with one of the six officially recognised religions in Indonesia: Islam, Protestantism, Catholicism, Hinduism, Buddhism and Confucianism

I am wondering why only these six ones.

Example: the main Christian religions within Indonesia are Protestantism and Roman Catholicism, but there is also a Christian group that belongs to Indonesia Orthodox Church. However, Orthodox is missing from the list.

Question: Why does Indonesian identity card religion include only 6 religions?