Your statement is not correct. Many early civilizations thought the world was round. In fact, in 1491 most scientists thought the world was round. Columbus thought the world was much smaller than it actually was and thought by sailing west he could reach the East Indies. His opponents argued the world was round but much larger than Columbus thought and that a voyage to the East Indies would be too far to undertake.
Your larger point that homosexuality is in some way new and innovative is also false. Homosexuality is as old as Sodom and Gomorrah. It has been widespread in the declining days of the Roman Empire and was widely accepted in modern societies such as Germany in the 1930’s. The Brownshirts were a homosexual organization and many of the top National Socialists were homosexuals.
thank you for your post — I was about to make many of the same points. These pro-gay marriage people are not only wrong, they are ignorant as a bag a hair.