This study aims to provide an understanding of the significance of the Reformation within the European History. In traditional European historiography, the Reformation is typically interpreted as a radical movement and as a sharp break from Europe's medieval past. However, such a division of eras is not crystal clear, but relative. In reality, the events in question cannot be thoroughly understood in terms of chronological division. Therefore, the researchers used the term "transformation" in the current study, which simultaneously conveys the continuity and change. Therefore, the Reformation represents (1) the transformation of godliness, (2) the transformation of the church's hierarchical system, and (3)the transformation of the ultramontane church into a decentralized church. Among the developments cited, the third had the longest lasting effect. Up until today, centralized and decentralized church systems continue to exemplify the differences between the Roman Catholic Church and Protestant Church.