Roel van der Hoorn
1- tableau has no limit (like other pax games)
It has no limit. Tableaus in Pax Pamir do have a limit, though.
2- once i put a token in play, the color is the religion, while it doesn't belong to some player.
Indeed. As a player, you're merely an investor in countries/empires.
So for example, if I had 2 knights (in 2 different city because a ciry can have just 1 token right?),
Except Constantinople, which can have 3.
if that empire pass to another player, he can use that 2 knights. Is it right?
Err... even if the other player doesn't own the empire, he can still use the knights, for example in a religious battle (like a Jihad). Players don't own any units on the board.