Wrong on both counts. For much if not most of history, marriage was one man and a bunch of women, or even one woman and several men.<quoted text>
Marriage is between one man and one woman. That's the way it has been and will always be.
And it is NOW frequently one man and another man, or one woman and another woman. Thousands and thousands of same sex couples are now married, and always will be.
This idea that families have always looked exactly the same is absolute bunk. The idea of what is a family has evolved a great deal over time, and this change to recognize the gay people who have ALWAYS existed but previously lived a miserable tortured life of hiding and lies and can now live openly as who they are is a very good thing for all concerned and harms absolutely nobody.