And I believe Longinus was the first vampire, right?
That's the new game - Vampire: The Requiem. The Lancea Sanctum covenant believes Longinus was the first, turned into a vampire as punishment for maiming Christ.
The Lancea Sanctum is rather interesting, actually, or at least I find it so (for as we've already established I have an irrational love of Judeo-Christian religious organisations). Think the Catholic Church, except they believe that vampires are a plague on mankind created by God, and thus to serve God they must be the monsters God intended them to be.
Needless to say, the other covenants don't agree. The Circle of the Crone (vampire pagans) certainly disagrees, and the Ordo Dracul (Dracula's covenant; wants to overcome vampiric weaknesses. The Lancea hates them for they think you shouldn't change a vampire's nature) may well, as it generally doesn't get on with the Lancea Sanctum. I doubt the Carthians (young reformers and political idealists) or the Invictus (nobles and aristocrats) care much, though, as they don't really bother with substantive religious belief. I understand a fair number of Invictus support the Lancea, though.
Anyway, the Lancea Sanctum believes Longinus was the first. Maybe they're wrong, maybe they're right. But in Vampire: The Masquerade, the first vampire was Caine - yes,
that Caine, Genesis Chapter 4 with an 'e' stuck on the end - and Longinus never comes up to my knowledge.