Though I disagree with your view on the atonement, I would be interested to research it so as to have a better grasp on it - what is the theory's name to which you subscribe?
I guess Ransom - Christus Victor. This seems to be the prevailing theme in Scripture. I believe that Scripture is very literal when it comes to foundational doctrines.
I believed, studied, and taught Penal Substitution Theory for decades. I held this view all through seminary (it was a Baptist seminary). One Sunday I was a guest preacher (pulpit supply) and preached a sermon of the Cross. The sermon was well received and I felt that it was a very good sermon. Went to bed feeling good about it. Woke up convicted that I had exceeded Scripture.
I bought a couple of dry erase boards and put them on the walls of my office. I wrote out the passages that support Penal Substitution Theory. Then over the next few months I erased all passages that did not actually teach the Theory without adding to them. No passages were left.
What bothered me was that all Christians affirmed the passages that I had listed, but within Christianity Penal Substitution Theory has either not existed or has been a minority view.
I would suggest trying that experiment (the one with whiteboards). Write down every passage that "teaches" Penal Substitution Theory and see if there are any that actually state that God was punishing Christ instead of punishing us for our sins. There are none.
But you will find that it is an abomination to punish the righteous and to acquit the guilty. You will find that God's wrath never falls on the Righteous.
So whatever view is correct has to incorporate those truths along with dealing with the "sin problem".
But to get a "grasp", I'd recommend studying one of the Christus Victor views (not modern Mennonite views, but perhaps Anabaptist theology during the Reformation).