Says the person is trying to use FUZZY reasoning in comparing homosexuality to taking a life. Homosexuality is a biological structure of a person's thinking like having blond hair and does not stop another person from breathing . Murder is taking a life and a totally different thing. That is why there is a commandment that states explicitly THOU SHALT NOT KILL. That is a sin.
"Sin" is based on the Bible ... actually on interpretations of the Bible. Murder may me a "sin" but it is more formally set forth as against the law. So, I suppose my answer would be murder will continue to be defined by legislatures, law enforcement, judges and juries.