That is false, since if you believe in monogenism you have to believe in evolution to explain the features. If you think not, explain how all the races came about if they all came from Adam?
It calls for some radical views. But if an accommodation were to be attempted, it would go something like the following.
In using Christ as a model, we have the restoration of the kingdom of God. Just like Jesus was one man, Adam was one man. And just like Jesus was no ordinary man, neither was Adam. For the sake of this discussion, in Genesis 6:3, after the fall we have:
Then the LORD said, "My Spirit will not contend with man forever, for he is mortal;
Then in Jesus (John 14:16) we have:
I am the way the truth and the life. No one comes to the Father except through me.
In that sense, we have original sin, coming through one man, and in his body, all descended from him. To put it backwards (for the sake of discussion), "I am the non-way the non-truth and the non-life, no one comes to mortality except through me". In that sense also, we are all descended from Adam with the body he established. We also have [original] sin being absolved by one man (Jesus) in the body he established through the resurrection.
I say body because some here have alluded to a pre-mortal state which I agree with. In this pre-mortal state is there the separation of races? It may not be so. As was given in Galatians 3:28,
There is neither Jew nor Gentile, neither slave nor free, nor is there male and female, for you are all one in Christ Jesus.
So if we are one in Christ, does that mean that we are separate in Adam (Note that I am only using this as a model and working the reverse here, for the sake of this discussion, to get an idea of what the Adamic lineage is like)? If Christ's body is the restoration of the kingdom in the "pre-mortal" state, is Adam's body the opposite? If all races and even sexes are unified in Christ, are they then made separate in Adam?
We don't know much about what took place during the course of the fall, but if perfection makes all races into one, does the descent into non-perfection make one, separate? I would liken it somewhat to shining a beam of white light through a prism. On one side, you have perfection, on the other side you have pure mortality. Would the fall be like immortality going through a prism, and the return from mortality going back through that same way? That would mean of course that yes, there are races but there is no separation per se. We all same- Adam, although dispersed for the sake of mortality. And we are all one in Christ.