So really, I see two options here. If my child is sent to Hell, there is absolutely no way I'm killing my child. I'd much prefer myself to suffer eternal damnation than my child. But if I was guaranteed that my child would go to Heaven in death, that would make things more sticky. I mean, sure it's still a horrible thing to do, but my child and I both getting into Heaven certainly sounds like the best case scenario here in the long run, compared to me refusing to kill him and automatically going to Hell and my child being a theoretical coinflip on where they go upon death.