I think maybe the problem is with secular society’s understanding of myth. In the modern sense, “myth” simply means “not factual”, and therefore, not valuable or necessary. That’s the legacy of the Enlightenment at its worst.
But the ancient understanding was different–myth was true, in a very real sense, because it told us something true about the world/us/life/God. That’s why there are two different accounts of creation in Genesis. One emphasizes the truth that life comes from God and is good, and the other explains and institutes the sacramental nature of marriage and families. Secular society would say that because the ‘facts’ of each contradict each other, they’re just ‘myths’ that we can toss out or ignore. But the Catholic understanding is that these stories were given for a reason–the Church has collected and handed them down as Sacred Scripture because they show us truths about God and us that we need to know. Historical veracity seems almost beside the point.
I’m a Catholic and I’m studying the sciences. I don’t believe the earth was formed in a literal seven days (I’m with the Catechism and St. Augustine), but that doesn’t mean I believe the Genesis story is just a silly little fairy tale. There’s more to it.