Unbelievable. So he can't imagine why anyone would refrain from murder unless they feared God and eternal torment in hell. it sounds like he is the one with problems.
From the sound of it, he should be less worried about killing someone to claim an advantage than would be an atheist. An atheist would have to live with the memory of taking the life of another, whereas he could just assume he sent someone to heaven and Jesus would forgive him.