Approaching it from a different perspective....
Scripture tells us that because of the work of Christ on the Cross, we ARE a new creation in Christ. Can a new creation be "uncreated"? It doesn't seem consistent to me. Therefore, I lean towards security in salvation.
As a side note but still relevant to the topic....
Consider that we are a new creature. We are born of the
dna of God himself. Not "becoming" a new creature. We ARE.. Is it possible, that as a new creature, we are not a human being that "needs healing". We are a creature that IS healthy. We just don't know it yet. As long as we believe that we "need" healing, we manifest the fruits of our beliefs. Sickness in need of healing. But when we begin to believe that we are the new healthy creation, we begin to manifest that which we believe... health. I ponder from time to time this thought and as I do, health seems to be a by-product of my considering that it's possible. And if/when I manifest the old man's sickness, it's because I forgot who I am.
I find that I used to believe I was sick, needing a savior to heal me. And all the while, I prayed and ask for healing. But I continued to manifest the sickness that I believed I had and was in need of deliverence from. One day, while lamenting my illness and struggles, I heard the Lord say, "why are you asking for what I have already provided? You ARE healthy. Just BE who I have Created you to BE."
As I began to consider the possibility... not really believing fully... just considering that it might be possible... sickness left and health began to manifest. Powerful stuff... this believing.
In our home, we have a framed Christmas card that my wife has put on the wall. It says "He became what we are, so that we could become what He is." Scripture supports that we ARE what He is.... one with the Father, new creations, the Law (of Grace) written on our hearts, Truth indwelling and so much more.
Being "transformed" is a matter of realizing (in our mind) who we are and resting in it. Just BE. His burden really is light if we allow ourselves to be who He has made us.
In the movie, The Matrix, there is a point where the nemis, Mr Smith keeps telling the hero that he is going to die, that it's inevitable. If you haven't seen it, in the movie, the hero's "old man" name is Mr Anderson. The evil Mr Smith says... "Here that Mr Anderson? That's the sound of inevitability. That's the sound of your death". And Mr Anderson does not refute the lies of his enemy. He simply says "My name is NEO" (neo = new) and proceeds to kick the enemies ..... He always was NEO, he just didn't know it. And when he bagan to believe in who he was, the neo man, he began to manifest the freedom of the Truth.
(stepping down from the soapbox now)