I think Veneration is a rock solid belief and wouldn't desire to break it up.
I like Veneration too. It's got a unique faith purchase mechanic that I think can be stretched into at least 2 beliefs though. I have always said I think the belief yield converters would work best as a follower. Just trying to maximize and use all the code available before demanding new tools.
Work Ethic seems decent. We already have a lot of hammer producing beliefs, but generally stacking hammers on hammers has a lot of diminishing returns, so I think this would just give more civs options for hammer beliefs, rather than creating a "super hammer civ". It might also be cool if workers could be bought with faith, though that would be a more ribbon ability.
There is no production-based Reformation belief. That's the last of the faith purchase X,Y,Z beliefs that I would want though; don't need to make that format half of all reformation options.
Also, just the mental image of the Dutch picking this belief and faith-purchasing mindmills is

*mwah*

. Peak Protestant.
Earthly Paradise - I like the idea of a belief around buildings. I think the world wonders is a bit much, there are already good beliefs around wonders and wonders don't need more help imo, but something around buildings and bonuses I think would be fun and solid.
Trying to think of triggers that don't happen every turn, like unit kills, or that don't scale astronomically into the late game, like Trade route completion, is pretty hard. completing a wonder is one of the few "rare" triggers left that could be made into a scaling founder belief trigger.
I don't really get what you're suggesting here, but I'd just as soon drop Caste system. We don't need 4 new founders, we just need 3 that we're happy with.
I think the viability of Caste system depends entirely on how happy people are with the Governor AI. People seem pretty happy to just automate workers at this point, so if we ever get to a similar point with city AI we can re-look at this proposal.
Call to Faith - Is this just another "gain X when you convert" people belief? Seems pretty generic and watered down, not my favorite.
We have Gain X yields from missionary spread, Gain X yields from Inquisitor de-conversion, and X yields when a whole city converts. The only one I can think of that we're missing is a basic catch-all for individual followers converted via any method.
I think it would be best if not all the new Founder beliefs added were slight modifications to the rare trigger with scaling yields based on followers/cities format.
Probably too solid. It's a +33% GP rate, before modifiers. That's huge.
Blood Tax - I'll leave that to the war people, my gut says this isn't all that great.
Basically a copy of the Honor policy. It's probably not great, if you compare the amount of free hammers that each free unit constitutes vs, say, Diligence. Could make the free units spawn more often if it's not strong enough.
I'm basically running out of ideas for viable follower beliefs that aren't just another faith-purchase building. I don't want to make every new belief just another one of those.
Mandala - A neat concept, I think it will be very weak at 10% distance, as I doubt that will give the holy city enough range to really reach out and get to your more wide spread cities, let alone opponent cities. So I'm not sure what the niche is here, Martyrdom seems much better for the "don't touch my cities with your religion", and orthodoxy gives better passive spread benefits. I could see this work with a TR focused spread, such as TRs from your holy city deal 3x pressure or something....although that would probably be broken with Venice.
Yeah, obviously for an enhancer as drastic as this, we would need to test what is fair.
Passive spread is most effective when compounding from several cities. So what level of power and distance (and in what proportion) is something that probably just needs to be experimented with in order to get the right level for 1 super-charged pressure-cooker city.
Martyrdom - I can get behind the idea of increasing resistance to enemy pressure....but the fact that's all it does is lame. Most enhancers give me really nice bonuses, and there is syncretism if I'm getting religiously swallowed. I'm not sure when I would take this one.
What if it also had the ability that halved the power of Great Prophets and Inquisitors? Then Prophecy/Sainthood would probably need another extra tool given to it.
Maybe Prophecy could be changed to:
Prophets of this Religion 25% stronger, cost 25% less Faith,
and have 1 additional Spread action.
+3 to base Holy Site yields.
Neopaganism - I'm worried that this + pagodas would just scale like crazy. I do like the idea of getting a second pantheon belief, that is neat. Frankly could we just do something where you select this, and instead of an enhancer, you could just select another pantheon from the main list?
I was talking about this as a Reformation; you think it should be an enhancer?
Sending someone back to the pantheon selection screen is probably a very difficult task re: the UI
Also, if someone could just pick a 2nd pantheon belief, would that mean you just get the dregs of what is left over? What about a larger map with more players? would you only get the choice of the last 2-3 pantheons left?
Lastly, there's the problem that Pantheons are balanced against each other specifically in the context of them being early-game boosts. So if you get to pick God-King as your Reformation belief, that's a lot stronger than if you got something like Expanse, if that was all that was left over.
But on the level, most pantheons are just weaker than either an enhancer or a Reformation belief, so getting a pantheon belief -- and nothing else -- as a Reformation would be really weak. It would need something else I think, ideally something that is tech locked, as almost all of the Reformation beliefs follow that pattern.