Truereligion is unique and non-diverse and contrary to what pluralistshave claimed, there has been only a single religion during the whole period when prophets were calling people unto God. Although this religion has haddifferent names,it has been the origin of all the teachings of all the prophets and, in general terms, it is Islam.Of course,the truth of religion has remainedunchanged,but shari’as have been different and unstable. This religion and this single truth was completed by the Prophet on behalf of all prophets during the last years of hislife when he introduced the Commander of the Faithful and it was named Islam and its outcomewas satisfaction of God. It is the same religion that will not be limited by the boundaries of space and timeduring the last days of the universe and will be introduced to the public by the Reformer and Savior of all periods and Islamwill be universal.