The dogma of substitutionary atonement requires Christ to die instead of us, instead of dying for us. Neither Isaiah nor St. Paul preached any such thing.
I also saw not a few Othodox apologists give too little emphasis to the doctrines of justification and substitutionary atonement. Granted, both of these have been overemphasized to the point of distortion among some groups in the West, but the doctrines themselves are biblical very important. Can't be that important, as the Bible doesn't teach it.
Try reading it again--particularly Isaiah 53 and Paul's epistles
In all seriousness, please note that although I pointed out these doctrines (justifiction and substitutionary atonement) are biblical and important, I did acknowledge a distinction between the biblical doctrines and the distortions of the same one may encounter in various modern Christian groups. I have often noted that in (rightfully) reacting to the distorions of these doctrines, some Orthodox apologists seem to disclaim that these these doctrines are biblical at all. (Thankfully, though, I have also encountered some Orthodox who do acknowlege a substitionary atonement and that Paul did in fact teach about justification.)
I'm not sure whose 'dogma' you are talking about, but by 'substitutionary atonement' I merely mean what the Scriptures say:
"5 But He was wounded for our transgressions
, He was bruised for our iniquities
; The chastisement for our peace was upon Him, And by His stripes we are healed
. 6 All we like sheep have gone astray; We have turned, every one, to his own way; And the Lord has laid on Him the iniquity of us a
"8 He was taken from prison and from judgment, And who will declare His generation? For He was cut off from the land of the living; For the transgressions of My people He was stricken
"10 Yet it pleased the Lord to bruise Him
; He has put Him to grief. When You make His soul an offering for sin
, He shall see His seed, He shall prolong His days, And the pleasure of the Lord shall prosper in His hand. 11 He shall see the labor of His soul, and be satisfied. By His knowledge My righteous Servant shall justify many, For He shall bear their iniquities.
12 Therefore I will divide Him a portion with the great, And He shall divide the spoil with the strong, Because He poured out His soul unto death, And He was numbered with the transgressors, And He bore the sin of many
, And made intercession for the transgressors." --from Isaiah 53
"24 but also for us. It shall be imputed to us who believe in Him
who raised up Jesus our Lord from the dead, 25 who was delivered up because of our offenses
, and was raised because of our justification." --Romans 4:24-25
"21 For He made Him who knew no sin to be sin for us, that we might become the righteousness of God in Him
." --2 Corinthians 5
" 24 who Himself bore our sins in His own body on the tree
, that we, having died to sins, might live for righteousness--by whose stripes you were healed. " --1 Peter 2:24
"18 For Christ also suffered once for sins, the just for the unjust
, that He might bring us to God, being put to death in the flesh but made alive by the Spirit" --1 Peter 3:18This is what I mean by 'substitutionary atonement'