In Amarr missions, it is frequently mentioned about how Blood Raiders are doing "blasphemous rituals" and other such things in their structures (which you are sent to destroy).
Rationale for knowing these things would include:
High standing with the Blood Raider Covenant
Extensive experience of archaeological/hacking exploration sites
Knowledge of the mission "Ritualist Raids"
Discussing them openly should attract frowning from Imperial Loyalists.
[spoiler]Here are three rituals, as described to Synthia by the Blood Raider Covenant captain Asias Urazmie.
the Ritual of Supplication
In this ritual, a group of Blood Raiders give up their blood to their betters. It is often used when a captain takes command of a ship, or someone is given a fresh group of slaves which are not intended for the blood farms, or a new blood bishop is appointed. The inferiors open a vein and drain a bit of their blood into a vessel, which their superior then consumes. In some large rituals, this forms a chain. For instance, my inferior captains took blood from their crews, I then took from the captains, and in turn gave to Lord Sarikusa.
the Ritual of Domination
As the name implies, this ritual takes place when the Raiders capture a particularly important individual, such as a capsuleer or an important Holder. All those involved in the capture of the individual drain a bit of his blood, proportionate to their rank. For instance, when I was a simple low-ranking captain, when my crew captured a Holder, my men would each get a single droplet of blood (at which point the Holder would be mostly dead). I would then take the rest of his blood until his shriveled husk was no more.
the Ritual of Dessication
This is a rather brutal ritual, often perpetrated against those who are unworthy. It is much like you saw in the church that night; we hook the individual to a machine which drains them of blood and offer it to any who would drink. This is often how our youngest and most raw receive their first blood, as those of rank such as I rarely dirty ourselves with such inferior blood. Of course, the man I brought before you that night was not so low. I did not wish to insult, after all.[/spoiler]