Memory as God
Vampires do not build religion around blood. They sanctify continuity of Memory - their own and what they steal - because Memory is the substance by which a life can seem to persist after personal Time has already failed.
The Archive That Drinks
The vampiric faith is easier to understand once blood is removed from the center. Aurelion's vampires survive through a ritual substitution of Time and feed on the memories of others. The Faith Atlas therefore names their god without personification: Memory itself, both one's own and Memory taken from another. Every major clan is described as practicing some form of this cult. The sacred problem is continuity. If the body persists but personal Time no longer unfolds normally, what makes the being who wakes tonight the same one who existed a century ago? Vampiric religion answers by placing identity in the remembered record.
That doctrine becomes an institution. Clans maintain Chapters and Archives of Mirrors where memories are stored as power rather than merely recalled as biography. The source gives the military consequences with unusual clarity: experience can be stolen, the Will of leaders can be suppressed, nameless oaths can bind, and a command structure may be decapitated without an open battle. A vampire who takes the right memories does not simply learn a secret. He can acquire languages, habits, skills and pieces of authority. In this culture, an archive can be arsenal, genealogy and chapel at once.
The Great Cycle makes the religion philosophically dangerous. Formal tables classify vampires as undead: their Time is ritually replaced, and they are not granted complete Will or Soul in the ordinary human sense. Yet another source asks whether choosing whose Memory to consume may itself constitute a kind of freedom. The contradiction should remain unresolved. Vampires may be preserving personality after life, or constructing ever more convincing imitations of personality from borrowed pasts. Their religion has every reason to insist that the distinction is meaningless. If Memory is God, then continuity is sacred regardless of how it was obtained.
This also explains the political shape of vampiric aristocracy. Authority accumulates where Memory accumulates. Old houses possess not only land and lineage but stored experience - the recollections of enemies, ancestors, servants and victims. A young noble can inherit a title; an ancient clan can inherit centuries of usable selves. That makes the mirror more important than the chalice. The vampire's true sacrament is not drinking. It is deciding which past will be allowed to continue.