I still am not sure if I completely understand your objection. Are you saying that the Church’s use of the Genesis creation story as a basis for its teachings on sexuality doesn’t allow for a proper explination of the sexually related variances we see today?
Though I have trouble accepting and understanding that the Fall causes such variances, party due to what I am about to say, I want to focus on the basic principles underlying the Catholic understanding of the Fall’s introduction of physical evils in the human world…
The traditional Catholic narrative states that the Fall introduced evil introduced physical evils (and moral evils) into the human world. This would mean that it was the Fall that brought about human diseases, sickness, and disordered conditions.
However, this explanation seems awkward and out-of-place in that accepting this view would be to say that the first humans were placed in a world that already included natural processes, such as biological evolution, that renders a Universe imperfect and corruptible. When we especially consider biological evolution and related processes, we have to recognize the features built into nature that allow for imperfections, sicknesses, and disease. For example, consider animals before the fall. I do not think anyone honestly open to scientific evidence would say that animals did not feel pain or get sick before the fall. Or that poisonous spiders and snakes did not exist. Or even destructive natural forces like earthquakes and storms.
The gist of what I’m saying is that the natural properties that allow for sickness and disorders in humans (such as Down Syndrome, same-sex attraction, or anything you want to consider destructive to a creature’s well-being) have always been built-into nature as part of our Universe.
The basic dilemma then becomes: Why a world set up like this, in the first place? Why place humanity in a world that consists of natural processes that allow for disease, destruction, and disorder? It does not make much sense to me to say God made a world like that but desired to alter how humans particularly experience that world (with divine protections, for example). We know that one day, in a New Heaven and Earth, there will not be natural processes with the same effects. Why, then, create a Universe at first with these effects? Why place Man in such a universe?
