I realize one thing that may make the argument I have made for The Man Child in Revelation 12 being The Church uncomfortable to some people is how it kind of makes Christ and his Bride siblings, both having the same spiritual mother (Israel, the Woman of Revelation 12) and spiritual father, God The Father.
I have used incestuous implications against other interpretations of the Bride of Christ, but those are against making The Bride his Mother. Sibling incest is a different matter.
Strictly speaking no Incest restrictions existed before the time of Moses, they became needed because of genetic deterioration. But while descendant-ancestor incest was painted negatively in the situation with Lot and his daughters, Abraham was in fact married to his half-sister Sarah.
Not to mention, Eve/Havvah would have been genetically Adam's twin.
The Song of Solomon is popularly interpreted by Christians as having a typological application to Christ and The Church.
I'm all for that, but I'm against using that as an excuse to render it irrelevant to Sexual Morality. Clearly the only book of The Bible that actually deals with Sex in detail should be relevant to the issue. But it's positive depictions of clearly non reproductive sex acts (before the marriage has actually happened) is very uncomfortable for the Prudes who base their Sexual Morality on Plato more then God's Word.
At any-rate back to the topic. If it is applicable to Christ and The Church, then it's notable that the couple in this book do poetically refer to each other as brother and sister, in chapters 4 and 5, and 8:1.
Jesus is the only Begotten Son of God, but all of us believers are his children by Adoption.