While specific doctrines, based on both tradition and different interpretations of the Bible, distinguish one denomination from another, largely explaining why there are so many different ones, the Four Marks, when defined the same way, represent a summary of what many clerical authorities have historically considered to be the most important affirmations of the Christian faith.
The ideas behind the Four Marks have been in the Christian Church since early Christianity. Allusions to them can be found in the writings of 2nd century early Church Father and bishop, Ignatius of Antioch. They were not established in doctrine until the First Council of Constantinople in 381 as an antidote to certain heresies that had crept into the Church in its early history. There the Council elaborated on the Nicene Creed, established by the First Council of Nicea 56 years before by adding to the end a section that included the affirmation: " in one, holy, catholic, and apostolic Church." The phrase has remained in versions of the Nicene Creed to this day.
In some languages, for example, German, the Latin "catholica" was substituted by "Christian" before the Reformation, though this was an anomaly and continues in use by some Protestant churches today. Hence, "holy catholic" becomes "holy Christian."
Roman Catholics believe the description "one, holy, catholic and apostolic Church" to be applicable only to the Roman Catholic Church. They hold that "Christ established here on earth only one Church" and they believe in "the full identity of the Church of Christ with the Catholic Church". While "there are numerous elements of sanctification and of truth which are found outside her structure", these, "as gifts properly belonging to the Church of Christ, impel towards Catholic Unity". The eastern Churches not in full communion with the Catholic Church thereby "lack something in their condition as particular Churches". The communities born out of the 16th-century Protestant Reformation "do not enjoy apostolic succession in the sacrament of Orders, and are, therefore, deprived of a constituent element of the Church."
The Eastern Orthodox Church, in disagreement with the Roman Catholic, regards itself as the historical and organic continuation of the original Church founded by Christ and his apostles. The Oriental Orthodox Church disagrees with both and claims to be the historical and organic continuation of the original Church founded by Christ and his apostles, the "One, Holy, Catholic, and Apostolic" Church of the ancient Christian creeds and the only Church that has always kept the true Christology and faith declared by the first three councils, Nicaea, Constantinople, and Ephesus affirmed by the Church Fathers and the Holy Tradition.