The purpose of this article is to discuss Shelley's views on religion. After a careful study, we found that in Shelley's day there was neither political nor religious liberty for the individual. Because thechurch was regarded as lifeless, shameful, corrupt, and inefficient, Shelley questioned the validity of the heartless hypocrite, although he was born in a conventionally Christian family. He admitted himself that he detested religion. In fact, one cannot form a just estimate of religion without knowing something about its history. He ignored the past, disregarded the wisdom of centuries, and tended to overthrow all that had already been done. It is true that progress in all fields requires a certain readiness to experiment with the unknown and try something new. A true reformer must link himself with the good already existing in society and war against its evils. If Shelley had recognized the positive value of improving religion and if he had had a better knowledge of the existing religion, we believe that his ideas of reforming religious institutions would have been more acceptable.