Yeah, so, I think it would be cool if Jesus showed up on True Blood... as a vampire! The story could be that Jesus was just some guy who got all into vamp culture and actually had access to the Vampyre Bible. Instead of actually dying on the cross, he gets turned and then that whole 3 days tomb thing (which really isn't three days if he went in late Friday afternoon and was out of it by Sunday morning... that's not even 48 hours) was just him completing the turn. And then he did some crazy stuff for his disciples and rose into the sky but really, he just started being a vampire and had super powers.
Of course, people got the story all wrong and nobody understood what he was really doing or talking about.
So, like Jesus could show up and then try and start his own Apocalypse which involves a whole lot of feeding on humans.
Might flesh this out more later... could make a good vampire story regardless of the True Blood universe.
