The church in general he doesn't really care about later as long as they leave him alone (he is an insane death mage though so if they get in his way he'll politely torture them into undead servants).
The people who killed his mother, well, he hates them so much he'll get mental status conditions from considering not taking revenge. Like higira says he hasn't got to all of them yet but I can't see why he wouldn't.
Rodcorte is an asshole but he's still too powerful for Van to take on directly at where the story currently is. But since Rodcorte's job is basically administering the reincarnation system and Van has powers relating to death, he can at least annoy him, and Rodcorte can't stop it because he can't interfere directly with anything other than reincarnation.