A person that does not believe in a God nor his creation must then believe that we are stardust that has become intelligent bags of meat, with brain fizzing that controls how we think and feel, in the end, and in the grand scheme of things murder has no moral bearing since its just bags of meat bumping to other bags of meat. Our existence is fleeting and in the blink of an eye we will be gone. I am not saying you have no sense of morals, no you do, but only because there is a god and he is apart of you. You think like you have a soul but pretend it doesn't exist.