How can you justify torture and murder or rape if it is not sin
These things are "morally" wrong depending on where you live? You have to have some rules to keep people from running amuck! That word "amuck" brings back memories. When I was much younger, I learned the definition:
"Some sources have identified Malays as having a particular tendency to run amok, making this an example of a culture-bound syndrome, but they are by no means the only people to do so. For example, W. W. Skeat writes in the 1911 Encyclopedia Britannica: "A Malay will suddenly and apparently without reason rush into the street armed with a kris or other weapons, and slash and cut at everybody he meets till he is killed. These frenzies were formerly regarded as due to sudden insanity. It is now, however, certain that the typical amok is the result of circumstances, such as domestic jealousy or gambling losses, which render a Malay desperate and weary of his life. It is, in fact, the Malay equivalent of suicide. "The act of running amuck is probably due to causes over which the culprit has some amount of control, as the custom has now died out in the British possessions in the peninsula, the offenders probably objecting to being caught and tried in cold blood."
Sin is defined by people for the most part. God has nothing to do with it. In Greco-Roman times, I do believe it was normal for men to live together and have a homosexual relationship. It was "abnormal" to have a woman for a wife!
Now isn't that weird!