I've had cities that founded TWO religons how does that happen?
Extreme good luck.

I've had cities that founded TWO religons how does that happen?
BINGO!Move your capital to the holy city![]()
Extreme good luck.![]()
I wouldn't go so far as to call it extreme good luck.
I wouldn't go so far as to call it extreme good luck. All else being equal, two cities that have the same number of religions, regardless of holy city or shrines, have the same chance of getting the holy city for a new religion. Even if you already have 5 cities and 1 religion which you've already spread around (where the holy city is not the capital), if you found another religion there's a 25% chance of getting a "double-holy" city. That is assuming all cities are equal size (ignoring the capital); if the shrine city is bigger than the others then it's better than 25% odds.
Same here. If it looks like I can get a couple of religions relatively quickly I usually build settlers, but don't settle them unless I have to so I can have all the religions being founded in the capital, or second city. Its a bit risky, but its a risk worth taking imho because of the gold you can eventually make.
Regardless of what the odds actually are, the occurance is very rare. I've only had it happen to me a couple of times, if that, in all the years I've been playing. I can only be sure of one occasion of it happening to me frankly.
The rarity of it happening to you is probably more based on the fact you don't found more than one religion very often ...