Marriage is and has always been about a man and a woman.
Marriage used to be about a man owning a woman, we changed that.
It used t be between a two people of the same race, we changed that.
It used to be between an adult and a child/young teenager, we changed that.
It used to be about never getting divorced, we changed that.
Why can't we change this?
Why not call it something else if you want to bring in a new institution or practice.
Black people were never stopped from drinking from water fountains, they just had to use their water fountains. Separate and equal is not equal.
Society for a long time have deemed that a marriage between a man and a woman is the basis for a family unit and the best environment to bring up a child. It is there to protect children and to strengthen and give them the best start to life.A mother and a Father bring different qualities and attributes to the table.
Irrelevant, sterile people and the elderly get married, parents who aren't married can raise a child just as well as two parents who aren't married. Society doesn't get to decide what is and isn't a family, neither do homophobes.
Why do gay people want to be part of an institution that is fundamentally hetrosexual and which has been for eons and which was established to protect the children of the offspring and to give a solid basis to society.
Marriage was created as way to build ties between different tribes and had diddly squat to do with children, you need to educate yourself.
Why dont they call it something else?
As I said, separate but equal is not equal.