Personally I don't believe in the afterlife at all. I think we return to nothing, I don't think there's way to describe it. Just no pain, no bad memories, no thoughts, no awareness, no nothing. Your Dad's probably trying to scare you out of attempting, that's not evil on his part but I don't think we should be dictated by fear about what could possibly happen in the afterlife/next life when no one has proof it even exists... I always tell myself that even If I regret it while I'm dying from my attempt, I won't once I'm dead. There's no regret when your dead, you're just dead. Everything important happens when your alive, I know the philosophy here is that it's your choice--your right but I think we owe something to the living, as shitty as they can be, to go out peacefully and ease their trauma with a non-messy death scene and maybe a few notes saying it wasn't their fault.