There's not supposed to be a corelation between relgions.
What I do note though is that all your pairs of religions are adviable about the same time, so chances are the city they ended up being founded in had the highest odds.
Basically it's your capital will never be chosen unless its your only city. Next cities without any religion are highly prefered. And I think if you have a state religion any non-state religion cities may also be prefered. If everything above is equal then it appears to be random but based on population/
What I do note though is that all your pairs of religions are adviable about the same time, so chances are the city they ended up being founded in had the highest odds.
Basically it's your capital will never be chosen unless its your only city. Next cities without any religion are highly prefered. And I think if you have a state religion any non-state religion cities may also be prefered. If everything above is equal then it appears to be random but based on population/
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