"Thou shalt not kill" etymology in Hebrew is about lying in wait to ambush and murder a human being without warning. You extended it to animals, and that's your prerogative, but the Commandments don't. I extend it to plants. My tomatoes, peppers, chives, and other herbs tremble in fear every time I pass by. Which one of them will be next? One of life's hardest lessons: In order for one to live, something else must die.
In any case, religion is not so much focused on good or bad as it is focused on love--wanting what is best for the other. It is about God--knowing, loving, serving God and his ways--being given first priority in one's life. It's learning to love as he loves--i.e., beyond self.