Yussel:
If (C”V, Lo Alaynu) someone had a child that was like that (drugs, murder, etc.), they would (and should) still be loved by their parents, who would always hope they would do teshuva. They would be loved by their parents more than a stranger.
Hakadosh Baruch Hu is our father. He loves us and is always hoping for us to return, no matter how far we have strayed.
As I did state, the non-jew will get rewarded (Olam Haba) for following the Sheva Mitzvos of Beni Noach and the Jew (if he does not do Teshuva) will be punished.