Why how or when it was 'made' up, or rather, how where or when the Bible was written is something we will never have an answer to. I'm pretty sure we would be able to kill other animals to survive, it's meant to not slaughter other humans without reason (not that there are good reasons for slaughtering other humans).
I'm pretty sure that religious people would have a counter argument for everything you put up here. The way I view religion is just a different set of norms and values applied to different cultures, it's something that is slowly being replaced by technology and laws. For me it's common sense that we respect others, meaning that we don't invade their privacy, steal their stuff let alone harm / (sexually) assault one another etc. etc. There isn't much wrong with the basic concept to be civilized really...
To me, we're all religious. We either believe in the same or a different god, or we believe in ourselves. It's all the same, #grouphug.
