This article first explores the fruitful influence of religious factors on natural law and the historical development of law and morality. Then we try to discuss that in our modem world in the area of morality and legal norm we should put more emphasis on the invisible impact of religion on the social norm. Today, due to the long development of many factors, law has attained a very high position in our society. However, in the matter of morality and law, it is very dangerous to take human rationality to be the only norm or to be the absolute standard in making judgments. As a matter of fact, the genuine spirit of humanity should be opened to heaven, earth, others and oneself. However, some modem people wish to get rid of the influence of religion. By so doing paradoxically it is easy to lead them to fall into the trap of narrowness of humanity and the subsequent damage. Christianity advocates the Creator of a personality who is the Ultimate Authority behind natural law. This religious influence is important for jurisprudence. If religious influence is being ignored, it would lead to the erosion of the dignity of law.