In this article we will discuss the canonization of the New Testament. Along with an investigation into who was involved in this process. The people and institutions examined will include the following: Marcion, Irenaeus, Origen, the Synod of Hippo, and God. First, let us consider the canonization of the New Testament. The earliest available list of books of the New Testament is called the Muratorian Canon and dates back to around 150 AD. It contains the four Gospels, Acts, 13 letters of Paul, Jude, 2 or 3 letters of John, and the revelation of John. These were accepted by the "universal church", there are some books left out and they are the following: first and second Peter, James and Hebrews. However, it is very likely that there was an oversight because Peter was first accepted as a valid book. There are no other books present that accept the Wisdom of Solomon, this must have been a mistake because that book belongs to the Apocrypha and was not added by anyone to the New Testament (Edwards et al, 2009, pg. 14). It is very likely that the early church's first collection of New Testament books consisted of a collection of Pauline letters. He was greatly fascinated by Paul's teachings but ultimately interpreted them in such an unbalanced way that he was considered a heretic. He would compete with the early Christian church by founding his own rival church, which would continue for several decades. It would teach that the God of the Old Testament was not the father of Jesus Christ, but was an evil deity. When he formed his books, he left out the New Testament books that depended most on Judaism and he also left out the Old Testament. In a reaction against Marcion, a proposal like this would make sense. The first “lists” of canons for the New Testament would appear only about a generation after Marcion (Varughese, 2004, pg.