LGBT ideology is ascendant, it is the progressive ideology supreme, the last moral certainty in a post-modern world and has seen off attacks from all major world religions. So it seems an ideal time then to start the discussion on how long this ascendancy will last.
I have three lines of reasoning to suggest that the answer is: "not long". With the caveat that I mean not long in the grand scheme of human history. My arguments are based on three rules:
1. Ideologies are transmitted through families
2. The poor have no choice
3. Survival wins
Rule 1: Ideologies are transmitted through families.
The history of Christianity is a history of the transmission of faith through families. From Adam and Eve through to Abraham through to New Testament households and to the present day. God uses the family to build his church and while there are, of course, example of people leaving the faith from Christian families, I would argue that the normal rule is for families to continue on in the faith. It can be seen in the political sphere too - with Labour / Tory voting households that go back generations.
The issue with LGBT is that it is literally a sterile ideology. If we accept that genetics is a strong component of who becomes LGBT then we must all accept that it will die out within a few generations. Whereas in previous generations the carriers of LGBT genes would likely reproduce as the societal norm was for marriage then now they are free to enter non-reproductive relationships. And while womb renting and sperm buying is possible, it is only available to the very small percentage of very well off.
So the more permissive a society is of LGBT, the less LGBT people reproduce and so the smaller their population will become in the long run. We are likely seeing peak LGBT around now, after every encouragement for everyone to come out of every closet. But within a generation or two the reproductive deficit will start to come into play.
Rule 2: The poor have no choice
In any society where children are an economic resource (i.e. they add to the wealth of the family unit) then LGBT ideology is not going to compete against economic necessity. We in the West have forgotten this but the poor cannot afford any choice over their reproductive choices. Economic forces dictate fruitful and fertile marriages wherever possible.
Therefore, any decrease in the West's wealth will have a knock on impact on LGBT numbers. Transgender surgery in particular is beyond the financial reach of 99% of the world currently and any recession in the West would quickly show what a luxury good it is to change gender.
I'm thinking too of the Roman Empire, where the rich elite could engage in homosexual paedophilia but the average citizen still required a reproductive family unit.
Rule 3: Survival wins
Any form of population crisis, either through war, famine or disease would very quickly lead to LGBT and abortion being banned. The survival of humanity is one of its primary concerns and it is only recently that we have reached the stage in the West where survival seems assured enough and the population / immigration high enough to care nothing about fertility rates.
But if a Black Death event occurs and wipes out a third of the West, the necessity for fruitful marriages would be the number one concern for a country. And LGBT can offer nothing in the way of fruitfulness. It is why support for LGBT and abortion go hand in hand together, both are set against human flourishing.
There is a deeper point here. In Genesis God commands the human race to be fruitful and multiply. God designed just one good way of doing so: a man and a woman in a lifelong marriage. And however much we try, if we want a flourishing society and a stable civilisation, we must have family units made up of a man and a woman in lifelong marriage.
When it comes to human flourishing there is only God's way. He has allowed us no other choice. Therefore, LGBT is a extinctionist ideology, the more it is embraced the more it decreases human flourishing and fruitfulness. A 100% LGBT human race is a dead race.
These are self evident truths. You cannot argue, although LGBT tries, with human biology and reproduction. They are also neglected truths, which only the West are rich enough or careless enough to ignore.
By the inherent nature of the LGBT movement, it is doomed by its success. There are no family units to continue its transmission. It requires a high degree of wealth which cannot be relied upon to last, and it requires a population which is not concerned with reproducing and surviving. It has been 50 years in ascendancy, LGBT ideology would be lucky to survive 50 more.