So that we’re clear…
According to Catholic Teaching - Genesis is never “myth”…
The Church uses Figurative language within portions of Genesis
The only so-called wiggle room concerns the length of time of “day”
Adam and Eve are real Persons - according to the Teachings of the Catholic Church.
The Fall occurred and yes incurred Original Sin
Church Teachings…
On the subject of creation, the sacred text teaches the truths revealed by God for our salvation,205 permitting us to "recognize the inner nature, the value and the ordering of the whole of creation to the praise of God."206
The Church, interpreting the symbolism of biblical language in an authentic way, in the light of the New Testament and Tradition, teaches that our first parents, Adam and Eve, were constituted in an original “state of holiness and justice”.
God himself created the visible world in all its richness, diversity and order. Scripture presents the work of the Creator symbolically as a succession of six days of divine “work”, concluded by the “rest” of the seventh day.204
Original sin - an essential truth of the faith
The doctrine of original sin is, so to speak, the “reverse side” of the Good News that Jesus is the Savior of all men, that all need salvation and that salvation is offered to all through Christ. The Church, which has the mind of Christ,263 knows very well that we cannot tamper with the revelation of original sin without undermining the mystery of Christ.
How to read the account of the fall
The account of the fall in Genesis 3 uses figurative language, but affirms a primeval event, a deed that took place at the beginning of the history of man .264 Revelation gives us the certainty of faith that the whole of human history is marked by the original fault freely committed by our first parents.265
414 Satan or the devil and the other demons are fallen angels who have freely refused to serve God and his plan. Their choice against God is definitive. They try to associate man in their revolt against God.