"I am amused by the idea that homosexuality is one of the 'symptoms of our failure to embrace pro-marriage policies.' In other words, the wrong policies turn people gay."
How about wording it "legitimization of homosexuality is one of the symptoms (etc.)? Then it makes sense.
"so many people think marriage is the ideal state of being for people and societies, and in the the next breath they want to deny marital status to gays"
That is totally NOT a contradiction. Real (man-woman) marriage is the "ideal state," and "gay marriage" utterly contradicts, not conforms to, that state. There is no "denying of marital status" to anyone; there IS a denying of "marital status" to relationships that are not true marriage.