Louella's thread about evolution of Amarr religions reminded me of some things about the Sani Sabik branches.
There are several branches, and I believe it is useful to keep this in mind.
There are also several locations of importance, which would influence later developments as well.
Firstly, there were the original Sani Sabik, on Amarr Prime. Campaigns by the authorities against the cults suppressed them for a while. Upon the rediscovery of space travel, the cults sprang back up.
Some groups went to Araz constellation, to found the Takmahl empire, which subsequently collapsed.
Other groups went to The Bleak Lands, some of which later formed the Blood Raider Covenant.
Other groups did not leave the Empire, and remained, although hidden.
After the collapse of the Takmahl, the Araz constellation was re-inhabited by the Empire, though it remained theologically controversial. The Sani Sabik and even the Blood Raider Covenant had a substantial presence there, for many years. A later campaign by the Empire removed the Sani Sabik from Araz. Only in recent years, have the Covenant made a return to pore over the ruins of the past.
The Sani Sabik living in the Bleak Lands, would have been greatly affected by the Blood Wars, which led to the expulsion of the Covenant from the Tandoiras constellation. Some civilian Sani Sabik are assumed by some to remain living in the Bleak Lands, although the region is not well patrolled, given the ongoing militia wars.
The region of Delve, and the inhabitants, I am unsure of the exact nature of. Apparently it was pioneered by Sani sabik and Blood raider settlers a few hundred years ago.
There are also the foreign cultists, Midna Lyre being an example, she is Gallentean.
So there are at least the following groups:
1. Original Sani Sabik cults and descendants that never left the Empire.
2. First wave of inhabitants of Araz, formed the Takmahl, collapsed.
3. Second wave of Araz inhabitants, driven out after centuries.
4. The Bleak Lands inhabitants, that never left.
5. Delve residents.
6. Foreign Cultists.
These different groups would have different traditions, rituals, and interpretations.
Anything more that is known ? I don't know where to place the Mul-Zatah, the Darkkonen, or the Crimson Hand, as I don't know much about them.