I just learned that Theodora can found a new religion even after her first holy city gets captured.
The Byzantines only have four cities left, and I have a Great Prophet. Is it worth it to try to convert them? Will they stick to their new religion even after a Great Prophet blast? Or will they start yet another religion as soon as they get another prophet?
I have Prophecy enhancer, so prophets are cheaper and stronger, but I also have the Holy Land reformation, which means I would prefer to settle prophets to get more delegates.
Edit for more information:
World Congress has just been founded, and I have a strong lead with 8 delegates compared to 8 other civilizations with 1-2 delegates each. I might be able to decree Buddhism as the world religion.
Two civs with a total of two delegates are (to the best of my knowledge) solidly Buddhist. One other civ is Buddhist currently, but with exactly half of her cities Buddhist she could easily sway either way. There's a six-city civ across the ocean who is just starting to get converted by his neighbors; with a great prophet I could convert him if I don't mess up (not sure if I want to risk it).
Also, as a result of Ceremonial Burial (grants faith and culture when Great Person is used) and a free prophet from Hagia Sophia, using my current prophet gives me enough faith that the next prophet will be two turns away.