It has been proved by scholarship and church history that the earliest churches which had the same scriptures we have did not believe penal substitution nor any of the other legalist theories. The Ransom/Christus Victor view is the oldest view and was taught for the first millenium - that's a fact. Neither the terms "Christus Victor" nor "penal substitution" were used, but the concept of Christus Victor was believed and taught from the beginning. It and such beliefs/terms as "recapitulation" were variants of the Ransom view. Anselm's Satisfaction theory came after the first millenium, and penal substitution was invented by Calvin. All of these later theories were based on a legalistic and mechanical view of God as feudal lord, governor, or judge.
All of these later theories were absent from the beliefs and teaching of the earliest churches who had the same scriptures that we have.
One more thing: You clearly misrepresent what Christus Victor teaches when you state that it "regards the death of Christ as non-essential". This view regards the entirety of Jesus's life and work as essential, from His Incarnation, to His Atonement, to his Resurrection, as He completely identified with humans and took on our identity so that He might redeem us and provide for our resurrection. It is a wholistic view of the work of Jesus, not isolating one aspect from the rest or overemphasizing one aspect at the expense of another.
Further, to state as you do that CV comes from the devil, based on your first false statement about the death of Christ, is a vile thing to say. You condemn the earliest believers and the first millenium of believers by saying such a thing.