You do not have an argument that has any credibility.
Only hot air.
Are you going to hold your breath until you turn blue?
Facts are not something you deal with, I realize. But marriage as an institution arose some 10 to 20,000 years ago as a the social animals we call "humans" became aware that the tribe or community is better served with nuclear family units. An incentive for males to remain with the female for the purpose of raising children resulted in stronger communities with children who were better trained and disciplined.
So human societies, the world across, independently developed marriage as a means encouraging and often enforcing monogamy between mating pairs.
Now I realize that you are but a spoiled child, that you want what you want because you want it - that no concept of anthropological rationality or societal structure is involved, which is why it's vital for the adults to stand up to you and tell you "no."
So because back then they thought that the world was flat, you gonna stick with that as well? Do you not want societies to evolve, but rather be stuck in time thousands of years ago? In that case, stop using toilet paper, they had none back then.