You did not address the rest of my statement.
The nature of humans requires opposite genders for humanity to survive. That some couples may not produce offspring does not invalidate the requirement. Homosexual unions can not - by their very nature - produce offspring. This fact has always been recognized.
Comparing homosexual unions to bans on interracial marriage is nonsense. Interracial marriages produce offspring, homosexual unions can not.
Homosexual couples can and do use surrogates for impregnation or birthing, as do straight couples. I agree with your moral case against SSM, but our preference has been defeated in the US legal system. And current law must obtain until and unless a future SCOTUS majority decides otherwise.