Yes, declaring war involves all the civs, as there are just 2 independent civs in the game.
What happened to all our workers? There are only 4 left.
I think the AP is in Huamanga. We should have captured that so we could be on the ballot without changing religions. Now, when I switch, Saladin won't be 'friendly', anymore.Before any civics changes and after microing the cities, we're making 74

per turn at 60% science. After changing to HR, Free Speech, and Org. Rel. we make 141

per turn, so I increase science to 70%. Leaving theocracy causes relations with Saladin to drop to pleased. We get +1 favorite civics bonus with our vassals.
I convert to Buddhism. Monty has 1 city with Buddhism, so I don't have to 'gift' him any cities. Before conversion 281 votes out of 375 are necessary to win. After conversion, we need 458 out of 611. It seems we have 242 pop. which doubled is 484 or more than enough to win, by ourselves. Which means we can't win that way? We gained 2

per turn. Relations with Saladin drop further to cautious. I trade Music to Joao, so that he would convert to Buddhism, now we need 462 out of 617.
1784 - The tiny city of Ica revolted and joined the Portuguese empire and against the odds, a Great Engineer was born in Adrianople. I used him to rush Ironworks in Constantinople.
I built more workers so we now have 5 stacks of 3. No vote was held on the Apostolic Palace. Currently 540 out of 720 are required to win and we have 518 by ourselves, if I counted right. Joao is friendly and I suppose we can count on him for his votes.
Personally, I'd like to win via Apostolic vote, because I've never won that way. This is true even if it is a boring click next turn type of thing, however it may be just easier to force the 2 remaining civs to capitulate thereby winning by conquest. So, therefore, I opted to research assembly line and combustion.