Just one of the big changes in the Fall Update
Religion has been overhauled. Religion gets fleshed out with new beliefs, new religious units, two new Pantheons, along with new Founder, Follower, Enhancer, and Worship Beliefs. These beliefs unlock the ability to build two new buildings as well as a new combat unit, the Warrior Monk. Finally, the Religion Lens has been overhauled to improve overall usability and readability. Beyond religion, there’s a number of other changes in store.
Steam Players
If you have the Digital Deluxe version, the content pack will download when you start the Steam client. Separately, the content pack costs $8.99.
Mac App Store Players
Download the latest 1.0.7 update for the game from your App Stores' Updates tab. Then, look for the In-App Purchases tab the next time you launch Sid Meier’s Civilization VI.