Ok. Lets do.
Premise#1: Non-constancy of Species.
You said somewhere, among other things, that the basic theory of evolution is the "nonconstancy of species". I accept this for argument sake.
By implication, then, it means that human beings, the species, was another species in the past, and will be so too in the future, something which the evolution hypothesis predicts.
Of course human beings will change, in physical aspects, maybe more brains, or less, more or less body hair, taller, shorter, fatter, skinnier, more uniform skin colour or whatever, but these are all non sequitor for human still remains the same species.
What I understand of evolution is that human beings will become a new species in the future, and perhaps you can tell me what this species can possibly be (and it can be a falsibility test for evolution, albeit million of years into the future, if it is predicted and recorded now.)
Premise#2: Man made in the image of God.
Now I know too, from non scientific sources - science not having the monopoly of truth, unless you disagree (which then renders everything below irrelevant) - that human beings were "made" in the "image of God".
Now there are a few questions immediately arising from this
fact and what evolution hypothesize.
I can firstly reconcile "made" with the interpretation that science informs us how God made man, namely that it was the process in which God created all the laws of physics (which is ultimately the basis for all nature processes) which allows organism to change either within itself or induce by its external environment, and to become more complex entities, at the expense of greater entropy elsewhere in the universe.
This interpretation is open to the possibility whether God, now and then, or even constantly tweak this innate mechanism, or even not at all, and that Nature runs as a perfect machine. Natural selection seems to say such tweaks are not necessary but does not preclude them either.
And this then is the scientifically informed and reconciled picture of the creation, than merely the idea that someone waving a wand over dust and abbacadabra hey presto there was naked man standing, all talking, all thinking and relating with his creator.
Further, and secondly, it also implies that various species in the lineage of man, evolved over a long long period of time before a particular species, became the man which is in the "image of God". The question is then, when did this happen, or has it even happened yet, ie the present species is not yet the "image" that God intended, and man is still evolving to be the species that will be the image of God.
Premise#3: Jesus Christ.
[Now] He is the exact likeness of the unseen God [the visible representation of the invisible];
He is the Firstborn of all creation.
[Col 1:15 (Amplified Bible)]
Of course if you do not believe in Jesus Christ, you need not read further, and, again, whatever I have to say can be dismissed outright.
However if you do not, then we can arrive at some conclusions.
First, we know that, at the latest, by the time Christ was born, man as a species, have attained the exact likeness of the unseen God.
You may say its only Christ, who is the the perfect image, but not any other man at that time. But Christ was of the same species as the rest of humanity, or unless, again, you disagree to that, and thus suggesting that he is of a different species other than man, perhaps a star-child(?).
But we know elsewhere that Christ is our brother, for if not his sufferings are irrelevant and inapplicable to us. And therefore, I rather hold the view that man, at the latest, attained the perfection of the image of God when Christ was born, and Christ, the Son of Man, was of the same species as each and every single human being since then till now, for all the world, even as I am, ie homo sapiens.
And, from the same passage, it said that Christ was the firstborn of all Creation, which seem to imply that this perfection was there from the beginning, but I need not go there for this argument.
Secondly, if man do indeed evolve into another species - million and million of years onwards - are the redemption plan, and the purpose and will of God, originally intended for man, still applicable and valid for this new species?
To be honest I dont know, even as I don't know whether God has any salvation plan for aliens on other planets, if ever one day we discover these. But what I know is that at the end of the world, in the new heaven and earth, God will be with men, eg
The abode of God is with men [Rev 21:3]. And we know from elsewhere too that perhaps there will also be the wolf, leopard, asp, adder and lion in this new world.
However the most critical and fatal objection to the evolving human species hypothesis is the question does perfection needs to be further evolved? For if perfection needs changing how can it still be perfection?
Conclusion
Thus on the basis of the revelation of Jesus Christ, the Son of God and the Son of Man, I conclude that man as a species have attained the perfect image of God, and, by definition, perfection needs no changing.
PS: Evolution seemingly have become the proxy battleground for believers and non-believers of Jesus Christ, where previously it was perhaps a more direct confrontation: Christians versus anti-Christs. But evolution, the study of change in mere physical aspects of living beings, is only one tiny tiny aspect of the fullness of reality and truth that is out there, for example the unseen and invisible realms, the spiritual dimensions of reality, the mind, plan, purpose and heart of God, the destiny of humankind, etc and how in all these does the revelation of Jesus Christ gives us insight otherwise not possible. There is ultimately a bigger picture into which science is, at best, a small part, if at all. And this bigger picture, encompassing things visible and invisible, times eternity past and eternity to come, is really the far more relevant and necessary thing for all knowledge and for life.