Early diplomatic victory without a single pleased or friendly civ:
1. Found religion for you, Confucianism and Christianity works fine. Those three firsts ones tends to spread too much and we don't want that to happen.
2. Build the Apostolic Palace.
3. Spread your religion to all your cities. (Or at least biggest ones.)
4. Use missionaries to spread your religion to rivals small cities so that every civilization has one city with your religion.
5. Vote your self to victory.
In this game, I had 23% of world’s population and Confucianism was less than 20% from all religions. This was on Monarch and victory was delayed hundreds of years because continents were really sneaky shaped which delayed 4th step. Final score around 73k.
1. Found religion for you, Confucianism and Christianity works fine. Those three firsts ones tends to spread too much and we don't want that to happen.
2. Build the Apostolic Palace.
3. Spread your religion to all your cities. (Or at least biggest ones.)
4. Use missionaries to spread your religion to rivals small cities so that every civilization has one city with your religion.
5. Vote your self to victory.

In this game, I had 23% of world’s population and Confucianism was less than 20% from all religions. This was on Monarch and victory was delayed hundreds of years because continents were really sneaky shaped which delayed 4th step. Final score around 73k.