They at least has a set of teachings to work with, it was then about filling the gaps.
If you read SA's page, you read about how it's a belief that the stars *can* influence the behavior of people, that X *is said* about them, that they *appear* to be irregular...
I don't see anything resembling medieval western religions...
It certainly does have set of fundamental beliefs and indeed a goal to which all in the religion should aspire to. It is known on no uncertain terms what the Bloodstars do and how they do it, in addition to how we should react to what they do and what purpose this ultimately serves. I'm not sure what you looked at on the wiki but you clearly missed out some pages:
http://wiki.battlemaster.org/wiki/Sanguis_Astroism/Catechismhttp://wiki.battlemaster.org/wiki/Sanguis_Astroism/Writings (referenced a lot in the Catechism but good to read on its own for extra info)
http://wiki.battlemaster.org/wiki/Sanguis_Astroism/Charter (the first part which has a simple outline of the beliefs, the rest is just administration stuff)
However I do agree with what you and others have said here that it's beliefs do not resemble a medieval western religion. This is because western religion in general focuses around personal a personal deity/set of deities. All teaching revolve around the desires of such a deity.
SA however has deities which are by nature impersonal; that is their desires are not known to mortals save through prophetic visions of which there have been only three. the Bloodstars act more as forces of nature; they influence our lives on a daily basis and so we seek to gain harmony with them through meditation and balancing their influences. However we have no indication that they desire us to attain this balance and harmony, it is merely considered natural for us to attempt to do so considering the importance of their influence as well as the fact that the human is considered to mirror the Bloodstars in the three-way divide between body, mind and soul.
So in that way SA is and will never be like any Medieval Western Religion however it certainly has divine powers, divine influences in our daily lives and a spiritual goal enough that I would classify it as an "authentic religion". In fact I would argue it is more of an "authentic religion" than many others in BM because it has a goal which a believer is supposed to strive to achieve during life as nearly all major religions do today, whereas many other BM religions simply has a "these are the gods, go and worship them and you don't need to do much else" mentality, with believers having little else to do save offer sacrifices.
The question I suppose is how far we want religions on an SMA island to resemble the religions of Western Medieval Europe or not. I would argue that no religion on Dwilight truly resembles a medieval western religion.
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