First, a disclaimer: I fully support whatever the Magisteriums says about Original Sin.
However, I fear the sometimes, people read into
Humani Generis firm rejection of polygenism that is not there.
Sorry, that wasn’t my intention; I was intending to leave it open. I should have said “our first parents.”
After all, even according to the Bible, Eve fell first, and she was followed by Adam, although most interpreters (including St. Paul, as you point out) seem to think that it was Adam’s fall that “counted,” since he was the representative of the whole human race.
I agree.
Here, I differ in my interpretation of the encyclial. In the passage I showed you the other day, Pius XII gives a very nuanced opinion. I realize that I forgot the give the citation for the paragraph: it is
Humani Generis 37:
When, however, there is question of another conjectural opinion, namely polygenism, the children of the Church by no means enjoy such liberty. For the faithful cannot embrace that opinion which maintains that either after Adam there existed on this earth true men who did not take their origin through natural generation from him as from the first parent of all, or that Adam represents a certain number of first parents.
Now it is in no way apparent how such an opinion can be reconciled (nequaquam appareat quomodo huiusmodi sententia componi) with that which the sources of revealed truth and the documents of the Teaching Authority of the Church propose with regard to original sin, which proceeds from a sin actually committed by an individual Adam and which, through generation, is passed on to all and is in everyone as his own.
Notice that the prohibition here is not absolute. If there
were a way to reconcile polygenism with the sources of revealed truth and the Magisterium, then it whould not be a problem.
After re-reading
Humani Generis, I think I would modify my second statement to read
There was a Fall that consisted in some kind of grave sin, committed by a historical representative of the whole human race (whom we call Adam), by which our first parents lost the state of grace, and consequently the praeternatural gifts.
I agree that a single historical person, Adam, must have been responsible for the Fall.