Here we have from Haydock another reason:
Concerning the transactions of these early times, parents would no doubt be careful to instruct their children, by word of mouth, before any of the Scriptures were written; and Moses might derive much information from the same source, as a very few persons formed the chain of tradition, when they lived so many hundred years. Adam would converse with Mathusalem, who knew Sem, as the latter lived in the days of Abram. Isaac, Joseph, and Amram, the father of Moses, were contemporaries: so that seven persons might keep up the memory of things which had happened 2500 years before. But to entitle these accounts to absolute authority, the inspiration of God intervenes; and thus we are convinced, that no word of sacred writers can be questioned. (Haydock)
Long age compromisers at least humanly speaking compromise the exactitude of the tradition of how the Fall happened - and therefore of the promises, given as a threat to the serpent. The promise being very relevant for the feast today, through the words "ponam inimicitias".
Hans Georg Lundahl
of the Blessed Virgin Mary