I like cultural civics too, but I also think they should be separate. As for religion, here is what I have come up with after some thinking.
#1 - There is a "Master" religion civic called
Identity, this controls the overall disposition and outlook of your civilization toward religion.
Atheist: This is enabled by default. Represents the complete absence of all organized religion. Enabling this civic locks all other religious civics.
**** A note on atheist --- Sounds unfair, but in reality there is no way to give religious based modifiers to an atheist society, but I don't feel that this means you can't give bonuses to those that do pursue religion. Honestly, there is not a single society in the history of organized human civilization that I can recall that was actually a legitimately atheist society. Even in cases of religions being outlawed, people don't stop believing, they just stop outwardly practicing. For those looking to run a non-religious civ, see secular below.
Secluded: This represents a civilization whose religious views look only inward and care nothing for outsiders. Xenophobic & hateful of others, but non aggressive and content to leave alone and be left alone. This is available upon establishing your first religion, the rest are researched.
Evangelical: This represents a civilization whose ultimate religious goal is the conversion of every person and spreading it's faith to every corner of the globe, for better or worse.
Intolerant: This represents a civ completely closed off to other beliefs and outwardly hostile to non-believers.
Pious: This represents a civ in which religion is seen as a tool for doing good and each man humbles himself to his faith in the name of serving the greater good, even gladly sacrificing their own health or happiness to do so.
Secular: This represents a civ that takes a hands off approach to religion. The state is seen as the ultimate authority on all matters and the church (if any exists) has no legal powers.
**** A note on secular. I figure the easiest way to answer your earlier question is allow to religion to be completely organic and evolve into whatever you want it to be. That said, the possibility of a society going through a secular phase cannot be ruled out. Therefore, better to build around it than ignore it. To do this, I propose that with secular enabled choices in the remaining religious civics will be limited to choices that are more compatible with secularism. Each category below has choices that are allowed with Secular. Obviously any bonuses assigned to those should be synergistic with w/e bonuses are assigned to secular itself.
After Identity, the first sub-category is
Structure. At what level is the faith organized?
Individual: Enabled by default, allowed with secular. Each person is responsible for their own faith. People may or may not go to central worship locations but it is a private affair with no public services. Most worship is done at home or away from others.
Family: Allowed with secular. Extended families form clans, and clans group together to form tribes. Religious education and worship is mostly handled within the family with none to some intercession from a religious body.
Local: Religion is centered around the community. A community has it's parish/district/temple/etc.. and it is the center of all religious activity. The leader of the local religious establishment is ultimately responsible for all matters of faith in the community and have discretion over their parishioners.
Regional: Like local, except that groups of communities are organized into regions, each with it's own central leadership. The regional leader is the final authority in his region on religious matters.
Centralized: Control is asserted through a centralized structure, with authority delegated out to several levels of clergy below an executive authority. There are no regional or national boundaries that limit the central authority.
Next category is
Message. This category is different because all options are enabled upon founding your first religion. This is meant to essentially sum up the core meaning of your religion in a single concept. Bonuses for this should be minor at best since no research is required. Since these are meant to really signify the ingrained behaviors and values I was talking about earlier, all are allowed under secular.
Improvement: Represents a faith based around self improvement and happiness. Minor happiness bonuses and/or minor % to improvement or building speed.
Salvation: Represents a faith based around the idea of forgiveness and redemption. Minor production or GP % bonus.
Knowledge: Represents a faith based on the pursuit of knowledge. Minor science or commerce bonus.
Glory: Represents a faith based on conquest and victory over adversity. Minor military unit production or great general emergence%
Tradition: Represents a faith based on honoring the past and that which is established. Minor bonuses to religious buildings, monuments, cetain wonders.
Next category is
Belief System. This describes what the people worship.
Tribal: Enabled by default. Allowed with Secular. This represents basic, loosely defined mysticism. No creator god.
Druidism / Nature Worship: Allowed with Secular. Represents a faith based around the worship of the Earth or it's various components as spiritual or divine. No creator god.
Ancestor Worship: Allowed with Secular. Represents a faith based on the reverence of one's ancestor's and living one's life in honor of their memory. No creator god.
Polytheistic: Worship of a pantheon of gods/goddesses.
Monotheism: Worship of a single god.
Next is
Influence. This attempts to define how the religion interacts with society as a whole.
Oral Tradition: Enabled by default. Allowed with secular. This shows the earliest and most basic form of religious influence, with stories/legends being the primary source of information relayed by word of mouth over the years.
State Church: Religion is controlled and funded by the state, but the church remains an organization within a larger government.
Free Church: Allowed with Secular. Religion is privately controlled and funded.
Theocracy: Not only is religion controlled and funded by the state, it IS the state. Civil government does not exist, the church is the law.
Rational: Allowed with secular. Religion is viewed as a guide and counselor but not always to be taken literally. People in this model prefer science and logic when a firm answer is required.
Finally, last category deals with
Afterlife
Mystical: Enabled by default, allowed with Secular. Represents a very basic and primitive concept of life and death.
Reunion: Allowed with secular. Represents a concept of becoming one with the earth and/or one's maker.
Reincarnation: Represents the concept of rebirth either indefinitely or finitely defined by some criteria.
Spiritual: Allowed with secular. Represents the idea of life after death but with no organized afterlife. Dead people come back as spirits and those spirits inhabit the earth along with the living.
Paradise: The traditional "heaven" if you will.
Anyways, that's all I got for now, it's reallllllllly late so i'm sry for any spelling errors or crap grammar, my internal "give a crap" switch got stuck off awhile ago
