A sin itself has no classification; it depends on the religion. Certain acts are known as sins in certain religions. Maybe what Islam declares as a sin, Christianity or Judaism doesn’t declare it as a sin. What is a sin then? A sin is a legislation of the religious law – it doesn’t necessarily have to be a bad act. If God doesn’t want you to do certain things and you do it, it’s a sin. Sitting down or standing up is not a sin; but if God says, ‘Sit down,’ don’t stand. If you stand up, it’s a sin. In other words a sin is an act of disobedience. If someone is a sinner, it does not mean he is a bad person because not all sins are bad.