Oh and on the point of religion. AI goes for Buddism first and can usualy get you by one turn if you both starter with or without mysticism. I'd suggest nabbing Hinduism since it will be one you need to research on the way to organized religion and you dont need monestaries with organized religion so you can skip Meditiation for a while. Of course if you plan on getting all 3 early reigions then that's a bit of a different story.
And religions themseves arent much different. Only difference is later religions give you a free Missionary after you found em.
You can spread as many religions as you want to your city, I'd advise more relisgions to bigger cities to get extra temples, but spreadign your state religion to all your cities is a must. You get +1 happiness and you need it for organized religion, Pacifism, and Theocracy bonuses.