It would be cool if other faiths can use the government type too, not just polytheistic faiths. Like, I want to be seen as the holiest person to exist since Jesus.
Based on art released, you could play as mono, poly and trans faiths while playing Mandala gov.
If you are talking about the levels of devotion in Dev Diary 176, this clarification was made in the comments:
To clarify: Since we have added extra levels of piety there needs to be piety level icons for all faiths in the entire game. In practice since Mandalas are for Dharmic faiths + reformed pagan ones and you can only unlock the extra levels if you are a Mandala it is very unlikely you'd ever see most of these icons currently however.
That's not stopping the Muslim and Christian adventurers who become Mandalas from trying.
Once Islamic states started showing up in the late medieval period, they tried a different approach, but many Europeans tried to use a descent from a saint, whether a true, rumored or fabricated descent, as a way to legitimize their rule. Even having a close family connection to a saint would be good though not as good as descending from one.
