For what is worth, just off the top of my head, I can remember two cases where a specific portion of a sectarian creation myth has been debunked.
First of all, there are churches that do not allow disagreement about creation tales, you either accept the church’s version 100% or you are a heretic. Therefore, if portions of their creation myth are proven wrong, a case can be made that their creation myth was debunked.
For instance, Jehovah’s Witnesses who question the official dogma are excommunicated for “apostasy.” Nevertheless, the Jehovah’s Witness creation myth was proven wrong almost 30 years ago.
Jehovah’s Witnesses believed before 1975, that each creation day lasted 7,000 years, and therefore the last day of the creation week, the Sabbath, lasted 7,000 years. . . 6,000 years where sin will be allowed to flourish, and 1,000 years where Christ will return everything to the original purity.
Using their creation myth, the Jehovah’s Witnesses claimed that man was created in 4,026 B.C. and Christ will start his 1,000-year reign in 1975. After the 1975 fiasco, the sect leaders dropped quietly their belief that the creation days lasted 7,000 years.
Another case in mind. A friend of mind was a member of non-denominational church where the pastor taught that the dinosaurs and other similar large animals became extinct 4,000 years ago during the Noachian Flood.
My friend became aware of the modern dating techniques and had extensive conversations with his pastor. Eventually, his pastor did his own research, changed his theology, and now his pastor teaches that the dinosaurs became extinct due to a cataclysm not mentioned in the Bible, probably much earlier than 4,000 years ago.
As you can see, Jehovah’s Witnesses were forced to believe a creation myth that included debunked facts. In the second case, a pastor changed his mind about a creation myth and so did all his church members in lemming-like fashion.
Finally, I want to thank you for injecting a modicum of sanity into this thread, since you have calmly responded to people at both extremes while expressing your prudent reservations. As you said, evolution is just a piece of the puzzle. Cosmology and ontology are still in their infancy.