No quests except one have anything to do with shrines and devotion points. There’s a list of them here
https://grimdawn.gamepedia.com/Shrines
Only the one labelled as Mogdrogen’s shrine is related to a side quest and to get that you need to be Honoured reputation with the Rovers faction.
There’s also a list of them with their requirements here
Depends on what you mean by way more. Act 1 will give you 7 devotion points if you’ve found all the shrines. If he went into Forgotten Gods early and did that then he could get 10 more points.