Exactly! That is the main reason the Orthodox split from Roman Catholicism - because many of Rome's dogmas were novel and had not been taught by the Apostles. Roman Catholicism tries to add "amendments" to the Bible - they call them "Sacred Tradition". Whereas Scripture says it is profitable for teaching, for reproof, for correction, for training in righteousness; so that the man of God may be complete, equipped for every good work. (2 Tim. 3:16-17). I doubt God forgot to mention anything important. ;o)
The MAIN reason the church split in 1054 was over the primacy of the Bishop of Rome. The other differences take a back seat.
Both churches accept the decisions of the first seven Ecumenical Councils of the undivided Church. These are:
The Council of Nicea
The First Council of Constantinople
The First Council of Ephesus
The Council of Chalcedon
The Second Council of Constantinople
The Third Council of Constantinople and
The Second Council of Nicaea.
There is therefore doctrinal agreement on:
The divine and human natures of Jesus
Apostolic succession
The threefold ministry of bishops, priests and deacons
The broad structure of the visible church
The sinless life of the Blessed Virgin Mary and the honour due to her as Theotokos
Invocation of the saints
Acceptance of the seven sacraments
Confession to a priest
Use of images in worship
Solemn celebration of the Eucharist and affirmation of its sacrificial nature as identical with the sacrifice of Christ
The Eucharistic bread and wine becoming the body and blood of Jesus Christ
Neither Church community subscribes to the Protestant teachings expressed in the five solae, especially regarding the teachings of salvation through faith alone (which these two communities understand as requiring no acts of love and charity) or of Sola Scriptura (which they understand as excluding doctrinal teachings passed down through the Church from the apostles in the form of Sacred Tradition).