Well, demons are Dracula's bitches in Castlevania. Death was Drac's bitch, but LoI I took to suggest Drac is Death's bitch and Death finds it much easier just to let vampires play with themselves (just like my fiance). So in a way, we can kinda rule the whole argument moot: if there is a Hell, there's apparently no Satan to pusnish sinners because Dracula would then have no control over the demons, since even in demonmancy, the demons still are more powerful than the invokers who are must appease the demons in order to save their own hides. So if Alucard dies and goes to Hell, so what? It's not a place of eternal damnation, just a realm of demons and enslaved souls.