By "Second Creation" I mean Heaven - and that Heaven was made a possibility by the work of Jesus Christ.
I feel strongly that what Jesus offered to Men was an added possibility (resurrection and Heaven) - added-to what was possible before Jesus. Yet, because it became available, and was something brought to the attention of all (after death, if not before) - the act of choosing to accept or reject Heaven, takes on a significance that did not exist before Jesus.
It is rather like someone offered promotion at work. Whether he accepts or declines that promotion, either way there are consequences. After the choice, he is not the same as before the choice. The reality of that choice is unavoidable transformation.
So it is with resurrection. The possibility of choosing to live wholly by love, choosing our own transformation to become wholly good and immortal - to leave-behind all of us that is corruption, disease, sin, and death... That chance/ choice/ offer is bound to change us - whether we accept or reject the possibility.
To know and reject a reality of good; is different from never having had the possibility of becoming good.
Thus Hell arose as a consequence of Heaven.
But why must we die to become good? Presumably, because of the profundity of the transformation. We must be unmade before we can sufficiently be remade.
But why must we incarnate, and into mortal bodies? Why not resurrect from being spirits; or incarnate directly into resurrected bodies? Because we must be bounded from God in order (eternally) to choose God, to affiliate with God: to be remade such as we shall thence be eternally affiliated with God in love.
...Such a decision can only be made from a situation of separation from God; such an outcome can only come from active participation in the remaking of the self - which again requires separation of the individual will from God.
...We must stand apart and on our own feet, in order to be able to come-together - with two purposes and two wills in eternal and loving harmony.
So an intermediate stage of incarnate but mortal life is necessary between pre-mortal spirit and post-mortal resurrected life.
What about Jesus - was he predestined from before incarnation to do what he did? No, that cannot be - Jesus must have been fully an agent in order to do what he did; therefore he was not constrained to choose as he did, but he freely chose to do what he did - from his own nature and self.
It was not foreknown that Jesus would be The Christ until he made that commitment, and became The Christ (anything else denies his agency, and destroys the necessity for Jesus's divinity).
Jesus first became divine (at his baptism, apparently); then died, was resurrected, and finally ascended to Heaven.
He did this that we Men may achieve the same end result, but in a different order:
We (in contrast to Jesus) first die; and then are resurrected to eternal divine life in Heaven (i.e. divinity, resurrection, Heaven - come after death and, pretty much, all at once, it seems).
(One exception: Lazarus was resurrected through the divine nature of Jesus, but before Jesus was resurrected - and only later, if at all - unrecorded - ascended to Heaven. Such exceptions are part of God's nature and working; because all individual Men are unique - indeed, all Beings are unique - so it would make no sense to be constrained to deal with multitudes of unique Beings in accordance with a standard pattern. By the very nature of things, there will be exceptions - therefore, exceptions to regularities or rules, are actually part of the rules!)
In sum; I find it very helpful to regard the work of Jesus Christ as a second creation.
The second creation was not 'logically' necessary; it was instead a gift, an offer, a possibility.
After death; a Man might choose to remain in the first creation (with various possibilities); or else to undergo the transformation called resurrection - requisite to dwell eternally in the second creation.
This possibility of Heaven changed the human condition thenceforth!
Because to accept, or to reject, this gift, this possibility - divides Mankind: divides indeed all the Beings of creation.