The faith bonus from doing a Protectorate War is not a bad idea, except for the religion requirement which makes it just stupid. Even if I didn't require a religion, I wouldn't call it good; but it'd still be interesting since it'd be situationaly powerful if you can get a protectorate war going. Of course protectorate wars are sorta weak in themselves, as in the CS could be dead before you can do anything, and you have to be suzerain in the first place.
Being able to chain golden ages seemed like a cool idea before release, but in practice the bonus does nothing to help you get a golden age meaning that it only helps with your 2nd one. That's what? like 80 turns minimum before it does anything and only helps if you missed the GA by a bit. If you were to overshoot anyways, it's useless, so it only helps you when everything comes together. Why not give a real bonus during a golden age?
The religion requirement applies to the double envoys not the +100% faith during protectorate wars. I really like the protectorate war bonus for Georgia. It is very easy to maintain suzerain over neighboring city states since those are the easiest to keep your religion. Not coincidentally, neighboring city states are the ones you can use most effectively use protectorate wars to protect. In my Georgia game I would say I had over 30% up-time on the protectorate war bonuses. This translates to over +30% additional faith over the course of the game, as I intentionally slotted in faith generating policy cards during my protectorate wars.