temples

Temples
creates pop equal to your worshipper cap
can assign worshippers to different tasks
decreases shrine base cost
clearing Atlantis unlocks more temples/tasks (repeatable every 33 zones)
The first task is scruffy exp, future tasks are based on archaeology relics
Worshipper milestones for permanent effects
temples directly increase pet xp by some%

Shrines (% of last 1 zones income cost)
Increase Worshipper cap
cap based on max Atlantis clears

Potential addition of monasteries above temples, and cultists which are permanent worshippers

Alternative

Temples increase shrine cap
Temples unlock a menu (like natures) which has things to worship, you donate materials to have worshippers come, % chance every cell that a worshipper arrives, based on current zone and current worshippers.
You can sacrifice your worshippers for cultists which are a magmamite like currency which allows you to upgrade your temples/shrines/worshippers
shrines remove 1 worshipper upkeep cost

Also, add fusion housing :)