If you are familiar with the Civilization series, we suggest you start from the normal difficulty and try to work your way up to the hardest levels. You should know that in order to win a game in the Deity difficulty, you need to have a deep knowledge of the mechanics of the game and...
The difficulty levels just change how much the AI gets to start with (“you start with one city; the other 6 players each start with two!”), which is not satisfying. I got a religious victory completely by accident once when I was the only civilization to found a religion. It doesn...