The Lord jesus and the Apostles saw his death in the context of Isaiah and all of the other prophets, as Him dieing in a substutionary mode for the salvation of sinners...
No one can deny that was the primaty focus of Him and John/peter/paul, and if the Church fathers held different views, they erred!
Why do you think that Jesus did not recognize any aspect of the Atonement apart from his death being a substitution for man? Or do you think it unbiblical to believe that Christ conquered death and sin, or that the Cross is essentially vital to God's work of reconcilliation, or that it is through Christ and His work that the Kingdom is established, or even Christ exalted by the Father, ....there is so much beyond a penal substitutionary motif that you must deny for your statement to ring true...where do you start in the process of denial?
Here is what I observe:
Your denial that God was in Christ reconciling the world to Himself directly contradicts 1 Cor. 5:18.
Your denial that the Atonement was purposed for regeneration, for healing, denies 1 Peter 2:24-25.
Your denial that Jesus Christ died that He might render powerless the devil is a denial of Hebrews 2:14.
Your denial that Jesus came to destroy the works of the devil denies 1 John 3:8.
Paul, John, Peter, and the author of Hebrews believed that the work of Christ exceeded penal substitution, something you adamantly deny. It is interesting that by your standards you would be a heretic.
AND AGAIN, no one is denying penal substitution. But Scripture provides its own context. It would be wrong, for example, to read Hebrews 2:14 as penal substitution. Perhaps that explains your unfamiliarity with those passages I listed...are you only reading passages that support specific issues?