Easily answered, refer to your Catechism - “The Senses of the Scripture”
1. The allegorical sense. We can acquire a more profound understanding of events by recognizing their significance in Christ; thus the crossing of the Red Sea is a sign or type of Christ’s victory and also of Christian Baptism"
The Catholic faith views that God’s word is in the scripture, the divine inspiration for its words - they are open to interpretation in so much as we must interpret them correctly, inspired by the Father. Catholicism believes in the divinity of the scriptures but DOES allow their allegorical and metaphorical interpretation.
It is the understanding, of the divine spark in all creation, of original sin, of, and here grannymh you identified it spot on - the traits inherent in all of our human natures reflected in Adam, Eve, Cain and Abel - so that we learn of the message behind them.
Therefore, as we are all here in agreement of what we Understand Genesis to mean in that respect, we are all following Catholic doctrine. Catholicism is one of the few major religious branches that does not call for a literal interpretation of scripture.
Surely the words do not matter but the message they relate - after all, they vary so much, compare a bible written 150 years ago to one written today, or for someone who can read the original hebrew or Latin texts - for example, it was only recently the ‘Valley of Death’ verse was read as much - the original reads far more closely to ‘the valley of darkness (as in lack of understanding)’, which oddly enough makes a great deal more sense.