People think less about J on his Zombie Day? That doesn’t track.
What I'll say verges more on interpretation than actual fact, but I am basing it on what is written. Hopefully it makes sense.
The manual has very little story, but it says that Dracula is reviving now, 100 years after his battle with Christopher, because people's faith in Christ is weakened. And as such, a black mass is held by those "of wicked heart" to revive him in a monastery at the town's outskirts, while the town holds an Easter celebration.
What I take this to mean is that those who have their faith weakened are the ones performing the ritual. It takes just one or two particularly determined loons succumbing to evil to think that a black mass for Dracula is a good idea and actually manage to pull it off.