It is absolutely Orthodox. Christ's Passion and Death were a rescue mission to deliver humanity from death. Not one Liturgical Prayer of the Orthodox Church views Christ's death as somehow "paying a penalty" on our behalf for sin.
St. Gregory the Theologian writes:
To whom was that Blood offered and why was it shed?...We were detained in bondage by the evil one, sold under sin, and received pleasure in exchange for wickedness. Now, since a ransom belongs only to him who holds in bondage, I ask, to whom was this offered and for what cause? If to the evil one, fie upon the outrage! The robber recieves ransom not only from God, but a ransom which consists of God Himself!....For it was not by God that we were being oppressed and next; on what principle did the Blood of His Only-Begotten Son delight the Father Who would not even receive Isaac when he was being offered by his father, but changed the sacrifice, putting a ram in the place of the human victim? Is it not evident that the Father accepts Him; but neither asked for Him nor demanded Him, but on account of the Incarnation, and because humanity must be sanctified by the Humanity of God, that He might deliver us Himself, and overcome the tyrant, and draw us to Himself by the mediation of His Son Who also arranged this to the honour of the Father, Whom it is manifest that He obeys in all things?"
- St Gregory the Theologian- Second Oration on Pascha.
We proclaim the deliverance of humanity from death and it's sanctification in our Orthodox Churches every Sunday in the Octoechos:
While the stone was sealed by the Jews, and the soldiers were guarding Thy most pure body, Thou didst arise on the third day, O Saviour, granting life to the world. For which cause the Heavenly Pow'rs cried aloud unto Thee, O Giver of Life: Glory to Thy resurrection, O Christ! Glory to Thy Kingdom! Glory to Thy Providence, O Thou who alone art the Lover of Mankind.
When Thou didst submit Thyself unto death, O Thou Deathless and Immortal One, then Thou didst destroy Hell with Thy Godly power; and when Thou didst raise the dead from beneath the earth, all the powers of Heaven did cry aloud unto Thee:O Christ Thou Giver of Life, Glory to Thee!
Let the heavens rejoice and the earth be glad; For the Lord hath done a mighty act with His own arm; He hath trampled down death by death, and became the first-born from the dead; He hath delivered us from the depths of Hades, granting the world the Great Mercy!
Having learned the joyful message of the resurrection from the angel, the women disciples of the Lord cast from them their parental condemnation, and proudly broke the news to the disciples, saying: Death hath been spoiled. Christ God is risen, granting the world great mercy!
Let us believers praise and worship the Word, co-eternal with the Father and the Spirit, born of the Virgin for our salvation; For He took pleasure in ascending the Cross in the flesh, to suffer death, and to raise the dead by His Glorious Resurrection.
When Mary stood at Thy grave looking for Thy sacred Body, angelic pow'rs shone above Thy revered tomb, and the soldiers who were to keep guard became as dead men. Thou led Hades captive and wast not tempted thereby; Thou didst greet the Virgin and didst give life to the world; O Thou Who art risen from the dead, O Lord, Glory to Thee!
Thou didst shatter death by Thy Cross; Thou didst open Paradise to the thief; Thou didst turn the sadness of the ointment-bearing women into joy, and didst bid Thine Apostles proclaim a warning that Thou hast risen, O Christ, granting to the world the Great Mercy!
From the heights Thou didst descend, O Compassionate One, and Thou didst submit to the three-day burial, that Thou might deliver us from passion; Thou art our life and our resurrection: O Lord, Glory to Thee!