Everyone here seens to love play a religion on their civs. I personally think it's not necessary for anything. I can see some benefits like gold or culture per following your religion or "for the glory of god" for buying great people, but I think it's not worth the effort to manage missionarys around.
Most of the time what I see is if you start and a corner your religion will be better, cause you will not suffer pressure from all sides, but in the middle, you are probably done. The only game that I had huge sucess with religion was with morocco. I didn't even planeed to have an huge religion, just got it to have the panteon, but sundly I pressured half of the wolrd with my religion at the point that holy citys would have only 1 follower of other religions. Big luck I guess...
Most of the time what I see is if you start and a corner your religion will be better, cause you will not suffer pressure from all sides, but in the middle, you are probably done. The only game that I had huge sucess with religion was with morocco. I didn't even planeed to have an huge religion, just got it to have the panteon, but sundly I pressured half of the wolrd with my religion at the point that holy citys would have only 1 follower of other religions. Big luck I guess...