Now we all are agreed that the universe is guided by certain fixed laws which are unalterable. The Law of gravity never changes whether one believes in it or not. The universe was functioning that way for millions of years before Newton ever told us that truth. Likewise there are moral laws which are under operation. No one can ever change them. While scientists discovered the physical laws, prophets discerned certain of the spiritual laws under operation through their interaction with God and as God revealed it to them. Every religion has discovered some of these in some form or the other. The very basic principle is that every cause has an effect. This is true physically and it is true morally as well.
Every person under the sky has some concept of good and evil. Every person has a conscience and can just live by it and be perfectly happy. But since every one failed there, God in His love made an ad hoc provision in Christ to forgive the past and to give power to live a new life. Whether one is a believer in Christ or not, the Bible is eloquent when it says, “Do not be deceived; what a man sows, so he reaps”. In fact, that verse was addressed to the believers. Faith in Christ which does not change one’s character is useless. One may accept the provision by God for the past miss-deeds and enjoy its benefits. There is power in the gospel only as long as a person continues in constant contact with the divine. If any one does not want that provision, it is left to that individual. Let that person be independent and be responsible for all his/her doings. But results are bound to come.