But we should.
Tell me why we shouldn't?
Because, JMV, if we never redefine things, nothing ever changes.
If Einstein and his fellow physicists in the early 20th century hadn't said "Newton was wrong about his principles being universal" and redefined physics, nothing would have happened. If Copernicus hadn't redefined the order of the planets, Darwin hadn't redefined most of the biological sciences, Jefferson hadn't redefined freedom, Emperor Ch'in hadn't redefined his country's borders, Alexander the Great hadn't redefined warfare, Julius Caesar hadn't redefined "republic"...etc.
Or, let me make this hit home for you: If St. Paul hadn't argued to redefine "Christian" as something separate from Judaism, and allow for conversions from gentile to Christian without stopping at "Jew" in between, would your religion have spread as much?
For good or ill, not changing anything leads to stagnation, and stagnation removes all forward movement.
It was a repressive law that didn't make sense as people of opposite races can just as easily be attracted to one another. It was a racist law barring a natural joining and a natural coupling.
So it was stupid.
Again, if something occurs in nature, it's natural. People of the same gender can be easily attracted to one another. Barring same-sex marriage is sexist.
Your argument. It is like a house built of cards. You start with your triple fallacy of "tradition", "popularity", and "nature", and then attempt to build upon it with large words to conceal that your argument is based on illogical standards that require hypocrisy to defend.
Traditionally marriage does not require that people be of the same race or religion...
Wow. How can you be so totally wrong? In the Eastern Orthodox church, marrying outside the church results in being denied communion until your husband/wife converts. While Jews and Catholics both allow for extra-religious marriages, they both come with the contingency that the children are raised within the faith. Mixed-race marriages were banned many places for many years. Traditionally, mixed marriages of race or religion may not have been banned outright, but they were HIGHLY discouraged.
But it CERTAINLY, INTERNATIONALLY AND UNIVERSALLY, requires it to be of the opposite gender.
Except for those places where it doesn't...which means that it is neither certainly, internationally, or universally required to be opposite gender.