There is a standard response to this problem: claim that the minority group is some great and corrupting threat to "civilisation as we know it". Preachers of Jew-hatred turned this into a fine art. The Protocols of the Elders of Zion, aptly labelled a 'Warrant for Genocide', is merely the most famous manifestation of what was, and continues to be, a continuing theme of Jew-hatred.
Jew-hatred is no longer an acceptable technique of mainstream Western politics (or religion). Queer-hatred still is (though less so as time passes). And queer-hatred has exactly the same advantage (effortless virtue to large majority) and disadvantage (bullying a small and vulnerable minority) as Jew-hatred. Hence the standard accusations against Jews are recycled against queers (that they are enemies of God, of Christianity, of Western civilisation; that they prey on children; that they spread disease; that they corrupt everything thing they touch or institution they are let into; and so on).
So, in a recent conference call with evangelical leaders, in the midst of some apocalyptic language from participants about the impending fall of the United States, Christianity and Western civilisation, Presidential hopeful Newt Gringrich offered the following:
It's pretty simple: marriage is between a man and a woman. This is a historic doctrine driven deep into the Bible, both in the Old Testament and in the New Testament, and it's a perfect example of what I mean by the rise of paganism. The effort to create alternatives to marriage between a man and a woman are perfectly natural pagan behaviors, but they are a fundamental violation of our civilization.(Via) A claim that could be (and was) previously cited against Jewish emancipation and female emancipation. (It was also used against other emancipations, but usually against less venerable restrictions.)
It is perfectly true, oppression of queer folk has been an enduring feature of monotheism. But one reason we no longer talk of "Christendom", but instead of "Western Civilisation", is that it has become a civilisation which no longer defines itself religiously. Its most defining feature is precisely its dynamism, its capacity for evolution and change. Including in moral perspectives: those of the C4th and C5th (when Jews, women and queers were stripped of rights they had enjoyed under Roman law) are no longer determinative.
Which gives conservative Christians no end of frustration. The reality of human sexual diversity is endlessly useful for certain conceptions of religious authority; as an endless war against human sexual diversity creates both endless selling of effortless virtue and endless training in moral exclusion. But this notion of a "frozen" moral perspective attacks one of the most fundamental features of Western civilisation--its capacity for growth: in knowledge, in moral understanding, in encompassing human aspirations. The notion that Western civilisation is so fragile that giving a small minority equal protection of the law will bring it down is nonsense.
But a necessary type of nonsense is one is going to pass queer-hatred off as anything other than a large majority monstrously bullying a small and vulnerable minority.