Cabert,
Regarding Spiritual:
This is, without question, a very powerful trait. I put it in the same tier as cultural (certainly less than FIN and ORG, but equal or better to others). There are several threads that discuss the applications of anarchy-less switches, too many to name. Personally, I feel it's strongest app. is late game. From 19th century onwards, so much happens in the window of ten turns. A switch is beneficial, but losing ALL hammers and ALL coins for a turn or two equals thousands of lost hammers/coins. Each civics swap or two late-game, therefore, by a spiritual civ equals a golden age for a non-spiritual civ (very rough estimation.). This, by itself, is extremely powerful. Cheap temples are tricky though. The only minor qualm I have w/ spiritual is that you then NEED to acquire a religion(s), preferably a holy city. This means either limiting research options or going to war with someone that may not otherwise be the best option. All in all, you may be correct in that SPI>CUL, but CUL gives a flexibility in tactical application of aforementioned strats.
cabert said:
i tried the same strat (maybe not as thoroughly as you did)
Possible, however unlikely. First, I have claimed a level of play of apprenticeship for good reason

Second, the Prince level game that I referred to bore quite a few big mistakes. Though it's rather embarrassing to admit, 1.)I accidentally put put two Nwonders in my big$ city before Wall Street. 2.) I ran on Despotism for the whole game 3.) I switched to Free Market when mercantilism would have been better, adding more anarchy later. 4.) My starting location, though good, could have been quite a bit better - floodplains, 1 cow, and 1 iron. 4.) Never got involved with overseas trade in continents game.
I did, however, supplement this with other strats mentioned in the forum - 1.)CS slingshot 2.) tech trading monopolied techs to all in same turn. 3.) aggressive w/ cottages. 4.) Using tactics 1-3 plus aggressive culture conquests, I was able to found the last three religions, adding your tactical advice to everything else.
So my play and application of strats, including my own, are quirky and messy at best; I'm trying to improve this. They are multi-faceted, though, and this provides the ability to dominate at Prince and survive on Monarch.