Is there a way to block other opponents missionaries from spreading their religion into your cities? I am currently playing a game against three AI opponents (Chinese, Egyptians, and Romans) and I was able to spread my religion in only one of them; the Chinese. I sent missionaries into the Roman and Egyptian cities as well, but I wasn't given the option to spread my religion in their cities eventhough they didn't have it. I would also like to find out how to block other Civs from spreading their religion into my cities if it is true that you can block this from happening. Thanks in advance for your help.