Tholish said:

Each civ can have exactly 5 religions. Whenever any of the civs cities gets a sixth religion a randomly chosen religion goes obsolete for that civ. This is working as intended. There are 15 religions and it would become unmanageable to have 15 rels in every city. Also, the popularitiy of rels really does ebb and flow. Its kind of an "event." In fact that's exactly what it is. If a religion is gone from your civ, you can resurrect it in your civ by building missionaries if you have built a monastery or if you are running Free Religion. In fact I have also toned down the research benefit of monasteries, in the latest version, to 5 percent rather than 10, otherwise a player could cycle through all 15 rels and build 15 monasteries in every city for a 150 percent research bonus. At ten percent this is worth the effort, but at 5 percent it requires a great deal of focus compared to benefit. Building 15 monasteries and missionaries in every city and sticking to a mediocre civic is a pretty big effort compared to just Library and University, which gets the same.

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