The Eastern Orthodox Church (encompassing national Orthodox jurisdictions such as Greek Orthodox, Russian Orthodox, etc.) is a body of Christians whose origins extend directly back to Jesus and his Apostles through unbroken Apostolic Succession. It is then seen as developing its doctrines further through a series of church councils, the most authoritative being the "Seven Ecumenical Councils" held between the 4th and 8th centuries. The present-day influence of the Orthodox Church encompasses the territories associated with the former Byzantine and Russian empires: Eastern Europe, Asia (Russia/Siberia), parts of the Middle East and Africa. Today, although Orthodoxy's strongest influence can be seen in Greece, Russia, Romania, Bulgaria and Georgia.
Orthodox Christians believe in a single God who is both three and one-Triune-Father, Son, and Holy Spirit, "one in essence and undivided." The Holy Trinity is three "unconfused" distinct divine persons (hypostases), with no overlap or modality among them, who share one divine essence (ousia) - uncreated, immaterial and eternal. The Father is the eternal source of the Godhead, from Whom is begotten the Son eternally and also from Whom the Holy Spirit proceeds eternally. Orthodox doctrine regarding the Holy Trinity is summarized in the Symbol of Faith.
The sacred book of the Christians - the Bible, in Orthodoxy is not always interpreted literally. In Orthodoxy, the true believer accepts what is written in The Bible, and never doubts it, but the actual attitude of Eastern Orthodox toward science varies, with conservative believers opposed to some concepts of evolution in the origins and development of life.Orthodoxy considers truth to be seen in the "Consensus of the Fathers", a perceived thread of agreement running through the patristic writings to the early Church and the Apostles.
The Resurrection of Jesus Christ is the absolute central event of the Orthodox Church and is understood in absolutely literal terms. Jesus Christ, the Son of God, was crucified and died, descended into Hades, battled Death and won. Through these events, He released mankind from the bonds of Hell and then came back to the living as a man and God. That each individual human may partake of this immortality, which would have been impossible without the Resurrection, is the main promise held out by God in his New Covenant with mankind, according to Orthodox Christian tradition.
In one way or another, every holiday of the Orthodox ecclesiastical year relates to the Resurrection directly or indirectly. Every Sunday of the year is dedicated to celebrating the Resurrection; most Orthodox believers will refrain from kneeling or prostrations on Sundays in observance thereof. The Orthodox tradition puts very little liturgical emphasis on the passion of Christ during the days leading up to the Crucifixion, and instead sees it as necessary stepping-stones to the ultimate victory only days later. However, the passion is seen as a model for the ascetic self-denial that the Orthodox believer is called to live out in his quest for God.