I wonder what those religious bonuses will be in CivIV. Originally, they said that the religions would not provide specific bonuses, just general ones that were the same for each religion.
Perhaps they might restrict your access to different governmental forms? Like maybe a Buddhist civilization can't have "Wealth" as a national value, or a Taoist government having "police state" or "totalitarianism" as part of it's governmental structure.
On that note, I must say I find it curious that Firaxis would choose Taoism over Confucianism for one of their religions. Taoism, as I understand it, never really has been a state religion, while Confucianism was the state "religion" of China for centuries. I mean, including Judaism was strange in my opinion, but at least there have been historical states with a Jewish national religion, even if Judaism hasn't really spread through conversion the way other religions have.