I just think it shows the reasonable expectation that a thousands-year old book (less for the NT), handed down first orally, having faced countless translations, mistranslations, transcriptions, mistranscriptions, having been controlled primarily by males for most of that time (and thus intersecting with gender and other forms of politics and power), the subject of debate, book burnings... would have been subject to a huge diversity of opinion.

There is no one reading of ANY book, and this applies to the Bible more than anything. Word of God or not, it's PEOPLE who have been interpreting it. And I think a Biblical justification for gay marriage is absolutely plausible.