Animals cannot sin. They follow a program that allows them to exist. A dog can be trained to bite or not to bite with a cookie (or several cookies). People on the other hand can make choices. Much of our lives are predetermined by our past and our surroundings but unlike animals we know and can choose between right and wrong. Considerer forgiveness. In the animal world forgiveness is not at issue, there is only now and next. Most of the time among humans forgiveness is not a practical choice. But if all humans can make a choice between right and wrong – can you see how forgiveness might work? Given the other person also can think and forgive? This is not logical it is faith and it can get you hung on a cross, or they could just take your credit cards.