I need tips about religion. I asked in a thread last year about this topic for Civ 5 and got some decent tips, but they don't work in civ6. I'm Australia and India is shooting for a religious victory, and most of my cities were his religion. In fact, the only city that was mine was my holy city. So I spent quite a bit a time churning out diggers to surround each of my cities, then converted them all to my religion. Now several turns have passed, and half the cities aren't Butterflyism anymore. Most are back to being India's, with a could others other religions. How can I prevent their stupid missionaries and apostles from converting my cities? BTW, I'm allied with every civ save America.