Hi Xyth,
I know I am coming a little late to this party. I hope that after 1.21 you tackle the religious buildings.
Selecting a religion should be more than just an aesthetic/Role playing choice.
I have read many debates between windows modders, about whether it was worth it to adjust the effects of religious buildings to suit the religions better. The overall feeling was that any major affects would alter the balance of the game, because the AI would have issues.
So maybe just a small step would be cool. Where the unique religious wonders for each religion had a slightly different benefit. But keep the other religious buildings as is. The benefits would not need to be so significant that they shift the balance of power in the game, but just small enough so that there is some reason to select one religion over the other.
As far as AI concerns, I've noticed the AI tends to pick religions associated with that particular civ. So the AI would pick as is it does now, and build religious buildings as it does now.
Unique Wonders. (Most benefits should be added to the current standard benefits of building wonder)
for the Druids: They could function similar to the old national park, except instead of commerce they receive +1 health/or +1 culture for every forrest in the city where it is built.
Christianity: Probably something war like, so that when it is founded, all others will fear the dreaded crusaders. You know -15% war weariness. A reflection on Christianity being used to justify wars throughout history.
Islam: Islam was a religion of peace and science for most of it's history. +1 science from monuments. (effect expires when monuments go obsolete) So that by the modern age this scientific advantage has disappeared.
Taoism: +1 experience to Melee units & +1 health per rice, fish.
A religion very connected to nature, but some of the greatest warriors were taoists, many of Sun Tzu's writings reflect taoist thought, and taoism combined with Buddhism led to some of the most badass shaolin warrior monks.
Buddhism: Peaceful, and vegetarian, so +1 happiness in all cities, +2 health per rice, fruit in city where it's built. However, +10% war weariness.
Judaism: +2 culture per bank & university. +1 experience for fighter jet. (duh, Jewish stereotype + 1967)
Hinduism: Hinduism was much stricter than Buddhism, but had some of the benefits of vegetarianism, though many of these societies today face serious health & overcrowding issues.
+1 health per monument/temple, expires when building becomes obsolete. And +50% birthrate in city where it is built.
This will mean that early in history the holy city will grow and be healthy, but by the modern age it may face issues with overcrowding.
Shinto: +1 experience points all units built in this city.
Throughout it's history whether it was swordsmen, archers, horsemen, or kamikaze pilots there has always been a strong warrior tradition.
ok my intern just walked in and looks like she looks lost, gotta run... but tell me what you think.