This is speculation. I suggest you locate a good reference for all of the cranial shapes of all human racial groups. This will clearly show the wide variation involved. The Pygmies in Africa are fully human.
Also, the Church tells us Adam and Eve were given preternatural gifts from God, including bodily immortality. Original Sin is dogma. That is why Jesus Christ was born to die as a sacrifice so that sins could be forgiven. And He rose from the dead, and raised others from the dead.
All I see - speaking generally - are attempts to discredit the Old Testament. Catholics cannot do that.
"22. To return, however, to the new opinions mentioned above, a number of things are proposed or suggested by some even against the divine authorship of Sacred Scripture. For some go so far as to pervert the sense of the Vatican Council’s definition that God is the author of Holy Scripture, and they put forward again the opinion, already often condemned, which asserts that immunity from error extends only to those parts of the Bible that treat of God or of moral and religious matters. They even wrongly speak of a human sense of the Scriptures, beneath which a divine sense, which they say is the only infallible meaning, lies hidden. In interpreting Scripture, they will take no account of the analogy of faith and the Tradition of the Church. Thus they judge the doctrine of the Fathers and of the Teaching Church by the norm of Holy Scripture, interpreted by the purely human reason of exegetes, instead of explaining Holy Scripture according to the mind of the Church which Christ Our Lord has appointed guardian and interpreter of the whole deposit of divinely revealed truth.
"23. Further, according to their fictitious opinions, the literal sense of Holy Scripture and its explanation, carefully worked out under the Church’s vigilance by so many great exegetes, should yield now to a new exegesis, which they are pleased to call symbolic or spiritual. By means of this new exegesis of the Old Testament, which today in the Church is a sealed book, would finally be thrown open to all the faithful. By this method, they say, all difficulties vanish, difficulties which hinder only those who adhere to the literal meaning of the Scriptures.
"24. Everyone sees how foreign all this is to the principles and norms of interpretation rightly fixed by our predecessors of happy memory, Leo XIII in his Encyclical “Providentissimus Deus,” and Benedict XV in the Encyclical “Spiritus Paraclitus,” as also by Ourselves in the Encyclical “Divino Afflante Spiritu.”