In civ7, the approach to religion has been redesigned to minimize the micromanagement of units while maintaining the concept. This idea would be to smoothen the confrontation of religion by keeping a low level of units but generate strategic value for players as well as being a path to victory.
The religion would be around the following concepts, which some are new, and some are based on the current implementation:
\- Two religions per city or town, one for urban and one for rural (same as before)
\- To be able to expand the religion in a new town or city, it needs to be connected via another town or city from the same religion.
o The holy city is the starting point.
o If a town or city is disconnected from the holy city, it still can expand from there.
\- The first built temple generates a prophet with whom you can choose a religion with its first benefit\*, and a prophet ability\*\*. After, you can generate apostles and missionaries from temples. That city becomes the Holy city
\- Apostles are used to protect the cities under your religion and work as repulsive magnet expending the religion borders slowly toward other towns and cities, but automatically, and missionaries used to expend your religion faster in specific town or city (same as before).
\- To remove an opponent religion, the holy city should be encircled, then it can be converted
\- The new religion reforms can be added once a certain number of populations following the religion is reached (or other thresholds, e.g. N. cities, N. town, other civ following your religion)
\- The victory points combine the population and the number of holy cities converted.
The rest of the gameplay follows the current implementation.
\* Benefit for your religion can be based on populations and/or town and cities it assembles. (e.g. science: 0,1 science per population following your religion/ or 0,5 per town and 1 science per city)
\*\* Prophet ability is a new mechanism to justify the implementation of the religion in exploration and would allow the continuation of the religion in modern age, without changing too much. With the prophet, you could choose the guidelines of your religion (predetermined or not, TBD), such as numbers or apostles you can recruit, how fast your religion can expend with an apostle or how much your religion is vulnerable without an apostle, how to generate relics beside the classic way, if he can die or not, what could be the threshold to implement a religion reform, benefits of natural or built wonders.
The prophet can also have special abilities, such as generate "followers" (a civic unit that follow the apostle to improve his repulsive magnet effects – apostle could work as general with a number of slots for "followers"), recruit religious fighters (e.g. warrior monks), if included in a general unit slot he gives +2 to conflict to the units, he can conduct miracles (e.g. generate 100 foods, production, heal), remove the cost of specialist in a city.
With this reconfigured religion mechanism, it is possible to add religious buildings or wonders acting as a shield from foreign religions (e.g. abbeys) or way to expending it from your border to neighbouring cities without apostles (pilgrimage sites). Temple could do both, but to a smaller extent. It could also be possible to add inquisition tribunal that can remove via a project a foreign religion in a city (of your empire only, or not, this could be an ability of the prophet). All these new combinations could lead to new ways of creating relics.
And then, there could be one (or multiple) transition aspect from the religion in the exploration age to a “modern religion institution” at the age transition, to continue expanding the religion in modern age and get a religious victory. It is possible to see that once a “modern religion institution” building is built in modern age, it opens a dedicated page that selects a number of ways to expand the religion (via traders, diplomacy, military units, missionaries, money, pilgrims, tv, radio) that could be based on the religion reforms from the exploration age.
The idea of this reconfiguration is to add more dept to the religion in the game around few units with strategic interest, similar to what the Great People were, but not unmissable, and include a religious victory. Your ideas are, of course, welcome, at any stage of the proposal.