There simply is no tenable concept of original sin if a personal Adam is trashed. You cannot even BE a Catholic if you deny St. Paul. There is no original sin to plague humans. We would not need Him. Corinthians 15 .
All doctrine hangs together.
By getting rid of our personal, single couple first parents, you have also gotten rid of sin, redemption, Savior, and salvation. The passage of time will prove this inevitably true. Apart from all that, it seems to me that no solid proof has ever been offered for trashing Adam and Eve as real people. If we do it, we lose too much and we get no advantage. They say Satan can quote Scripture to his own purposes.