Meh, in my opinion this is based off of too many assumptions.
But ok, lets suspend disbelieve and ahem, other stuff.
Regardless of names and lineages, why would there not be a evil counterpart to the holy trinity? Hrm, well, it does not feel like that; Part of that trinity is everywhere; How do you get a counterpart to everywhere? Nowhere I guess but that is kind of silly in this context. Um, poo. Even abstractly I can't seem to put my paw on it. I think the 'trinity' is missing one;
*shrug*Amusing thought anyway.
Still, irregardless, what would be the inverse/opposite of the 'holy trinity' be? From what I understand 'holy' is basically 'life', so I suppose 'Unholy' would be death?
*shrug* Mayhaps it should be phrased creation and destruction then. Hrm, I guess that could work; I don't think it matches the 'facts' but
*shrug*, tis kind of hard to tell from this angle

Anyway, as I said, amusing thoughts.