Jain religion OP?

Is it me or is the Jain religion very strong? Sure, it's hard to conquer new lands, but it's very easy to keep them under your control, withe Jain bonus to vassal relations (+30 to +35, omg!) and revolt risk.

[edit] I forgot to mention the ability to take three concubines, to choose your heir (always a genius ruler), the amazing +3 demesne bonus, the +.1 prestige bonus and the +1 piety bonus when at peace.