We can keep going if you want.
I’m not too interested whether as a matter of fact gay Catholics can change. Change from gay to straight does occur; for example, some women who identify as lesbian one day, will identify as straight the next (Lisa Diamond studies this phenomenon). There was even a case I heard about of a man who turned straight following a series of strokes. However, deliberately changing one’s orientation through therapy is a totally different matter, and it is natural to be sceptical about the idea.
From what I’ve heard about sexual orientation in males, it seems like it would be a genuine miracle if a man changed from gay to straight. We have NARTH claiming a rather low success rate, ex-gays who claim still to have SSA even after years of therapy and marriage, and the APA’s report on effort to change sexual orientation which claimed not to be able to find evidence for success. All of this taken together allows me, with a clear conscience, to reject as unproven and probably false the idea that homosexuals can deliberately change their orientation through therapy.
But on the whole, as I said above, whether change is possible is not very interesting. The question which is of great interest is as follows (I’ll phrase it hypothetically on the off chance that Hume’s Day has come and the APA is wrong): Suppose there are gay Catholics who will never be able to change their orientation. Isn’t it true that such a person could expect never to marry, never to become a priest, or a monk or a nun, and always only to live a very solitary life out on the fringes of the Church? Is this a good thing, or a bad thing? How could you get such a Catholic to accept his or her “spiritual leprosy” with grace and humor?