Rainboy, I have been following your argument and find myself mostly in full agreement with it.

However, I have to comment on one point here:
"Whereas homosexuality, and other sexual identities, just don't "make sense" in any clear, cohesive way. They seem to "go against common sense". The only reasons I have heard for why homosexuality is morally right (and approved of by God) seem to involve having to understand Greek, Hebrew, and advanced biology."

I don't believe "common sense" is a good guide in these matters. Simply because much of what we call "common" sense is in fact "cultural" sense. It makes sense because its familiar, because its commonly held belief, or because everyone else (read the majority) is doing it. I'm sure you'd agree that all such sense must be subjected to the authority of Scripture and where in disagreement, Scripture wins.

Secondly, our bibles are translations from Greek and Hebrew languages. They are also historical documents from Greek and Hebrew cultures. It is actually essential that some members of our community must be examining those linguistic and historical details and informing us about how they effect our understanding of the texts. Fortunately there are plenty of people out there doing that and we get to read their writings and learn from them. Of course at the end of the day we have to come to our own understanding of the Scriptures with the conviction of the Holy Spirit, but we cannot discount the need for scholarly helps to understanding. This is especially true when trying to formulate theology on issues such as sexuality as we are doing here.

Blessings
Cat.