The modern Native Americans might be surprised to learn that they have apparently ‘disappeared’!
Bit of a misquote, yes? I said most of the many gay marriage friendly cultures. The native Americans have not disappeared. There are slightly over 5 million people in the US out of a total of 316 billion US citizens. Their culture is ravaged by alcoholism and secularism. I hope that is not your model. (btw, they are also of course mostly straight or they wouldn’t still be here, and many would be quite horrified to claim any sort of kinship with you on the issue, absolutely horrified, most I would say

) I grew up near several reservations - don’t remember a single gay Indian person. (not saying they don’t exist, just that I never saw one in their community - they actually get pretty redneck - pick-ups, whiskey, partying, etc. I dated one in high school.)
But as regards your Darwinian theory of sociology, are we not having this discussion precisely because the secular liberal cultures are overwhelming the conservative anti-gay ones?
Actually, I think the pattern in history is “anti-gay” or “pro-life” cultures (as long as we’re using loaded inaccurate phrases) overwhelming corrupt ones. I do agree with you that classical, pagan societies were much more permissive of gay relationships (once described to me as voluptuous relationships vs. fertile ones by a gay person), but they never put the two on the same level, or allowed for gay marriage. This notion would be absurd to them, completely opposed to their concept of social order. I would also add that the Gods of this same culture practiced rape and bestiality. Lastly, this culture did not, in fact, prevail.
However, I also agree with you that, yes, pagan culture is returning in the form of Western secularism, and growing in strength. Based on the Darwinian model we see in history, this culture will face the same demise and decay. I am not aware of a successful model, unless you can point it out to us. The ongoing conflict with Islam I think will intensify, and it is questionable if the West can withstand these forces (i.e., Sharia Law). (The believers vs. the unbelievers.) I think the effects of the Western demographic winter will play against us too. Our people are not reproducing at the same rate as other populations. Euthanasia, suicide, abortion, gay marriage, disintegration of family life, these trends are all undermining our health as a culture.
Honestly the question in my mind, and I am really being truthful, is this - is this effort by homosexuals calculated to harm the whole of society or is that just an unintentional side effect? (you don’t need to answer) I go back and forth on what I believe in that regard. This gay marriage effort does confirm my sense of homosexuality as a psychological disorder. But, in a broader cultural sense, I am more worried about the widespread heterosexual acceptance of the practice of homosexuality than the small number of people who actually engage in it. With this group I think charity is in order. Straight acceptance is indicative of a more dangerous malaise.
One interesting development I would point out is the rejection of Islam in African countries and the embrace of orthodox Catholicism (against gay marriage). Catholicism is also growing in Asia. In other words, the above described trends in the West are NOT happening everywhere outside of Islam. There is some wriggle room between the decay of the West and the spread of Islam.