(If he was properly indoctrinated, Valentino would've be pretty susceptible to joining the Eternal Order of the Second Death. Even after being ordained. He could've been taken in by their love-bombing kindness, compared to being treated as more of junior priest by members of the church, being talked down to and asking things of him with little thanks. He'd then feel the urge to stay so as to not let anyone down. He's not completely hopeless though, the minute he saw a corpse being treated with disrespect he would've tried to bounce.
Abigail on the other hand, would be largely resistant to the cult's influences. She and her family are still somewhat close, despite the distance. While she is somewhat othered by the sisters in charge, she is casual friends with some of the younger ones so she's not as isolated or talked down to. It's up to interpenetration how deep the cult's connection to Beelzefest was, but their connection to metal music and the community would probably be their best chance to get her into the fold.)