bathsheba666 said:
I set out to research Buddhism(Meditation?),
but part way along my scouts discovered Polytheism.
So my state religion is I think Hinduism in my capital city.
I discovered Buddhism, built a second and third city, all connected by rivers so I was expecting my state religion to spread.
If I press the Convert option, it seems to show that my second city is Buddhist, but my third ciy is Hindu, like the capital.
In the build options, it will let me build a Hindu or Buddhist temple in my first city.
It will only let me build a Buddhist temple in my second and third cities
Can anyone explain this?
Obviously you failed to understand the game mechanics for religions.
You found a religion in one of your cities when you discover certain techs.
Meditation gives buddhism, polytheism gives hinduism, monotheism gives judaism...
Founding a religion doesn't necessarily mean you have it as a state religion.
You CAN switch to this religion as your state religion, since you have one city with the religion in it.
But it's not automatic.
Another aspect that doesn't seem familiar to you you is religion spreading.
First, you can have multiple religions in one city.
Second, when a city doesn't have a religion in it, one can spread to it automatically, with higher probability for a religion
- from a city connected through a trade route
- with temples/monasteries/shrine/cathedral.
Being state religion has no influence on the spreading, if you're not running theocracy.
Obviously, this happened to both your second and third city : buddhism spread to them automatically. Now that they have buddhism, no other religion will spread automatically in them. If you want hinduism there, you'll need to build hindu missionnaries in your capital (needing organized religion or a monastery) and send them there.