Actually, in Christian lore the devil will be another inmate in hell, not the leader of it.

Growing up, the justification for hell I always heard was this: No one is torturing you in hell. Hell is just the complete separation from God, which is in and of itself tortuous. God doesn’t want to separate you from him. But if you’re sinful, and haven’t accepted Jesus’s washing away of your sins, he doesn’t have a choice!

I don’t really think this holds up, and honestly I’ve kinda forgotten why I was writing this comment in the first place.