Currently religions aren't planned to be made by the players themselves but I would imagine that there are multiple religions people can choose to worship.
So here is my suggestion for player made religions.The current plans for religion don't include worshiping your own gods, or starting new religions. It's an interesting idea though. We will take note of it.
When a player starts a religion (and has all the requirements for it) he has to decide a couple of things from a preset list.
Deity name: (name of the god)
Deity type: (Could be something like "Animal", "element", "Spirit" or something like that)
Idol: (sacred object or icon)
Build style for temples: (just give a list of styles, preferably multiple types that we can combine to make our own)
Special unknown feature one:
Special unknown feature two:
To explain the last two things on that list I'll give another example. Assume magic comes from religion, here you can choose (maybe based on alignment) what magic type your followers get.
So it could be something like this:
Name: Order of the holy flame.
Description: A religion that worships fire
Deity name: mr. Volcano
Deity type: Element
Deity description: Living volcano guy
Primary Magic: Fire
Secondary Magic: Holy
Build style one: Cubism
Build style two: Concrete sewer tubesism
So basically something like Tribes, where you can choose your own stuff from a list.
Did I explain everything right? :P