User blog comment:Fusedtwilight/Possible Season 11 Plots/@comment-3045936-20150521200018/@comment-2020973-20150522010046

It could be that God is incapable of killing anything. If he and Death are opposites of the same coin it would make sense he can't kill because he is life/creation. Obviously he is making beings more then capable of an immense amount of destruction to do the deed.