Well if you count your cities, divide that number by your percentage you now know how many cities are in the game
In my Warlords game I have 15 cities, 14 have Taoism (19%); has spread to 7 other cities, for 21. 21/0.19 = 110.5, manual count of cities is only 77 (62+15)
Which doesn't add up; percentage apparently is not calculated how I thought.
Apparently since I am the only Civ that has Taoism as a state religion only my cities count towards the percentage. 14/0.19 = 73...
Cyrus has Christianity (14%) in 9 of his 10 cities; 9/77 is 12%... (it has spread to 9 other cities incl 2 of mine; 18/77 = 23%, no dice.
Wang Kun founded Buddism (12%), in 8 of his cities + 2 others, 10/77 = 12%
Wang Kun professes Buddism, no one else does. He also has Islam in 2 cities, which has 2% ...
So I guess the percentages are actually meaningless. They don't even match up with number of cities that profess the religion out of the world. Nor do they match up with the number of cities that the religion has spread to in the world.
So I suppose, technically it is "game information", I just don't see how that is relevant.
The game blatantly tells you what tech's the other civs have and what resources. Just by clicking on a CIV in the normal Foreign Advisor, the Resources/Techs you have - that they have, are removed from your trade list. Then it also shows you what they 'wont trade' and what they will trade - that you don't have.
It might as well just show each CIV and the tech's they have in the tech tree
That is all "abusable" information that you shouldn't know at all.
Religion spread to X cities would just be "fun" to know.