When people say gay marriage is unnatural because they have to adopt, say George Washington and Julius Caesar. They both could produce no heirs and both adopted. Washington adopted Martha's children and Caesar adopted Octavian, his grand nephew.
So if the only purpose of marriage is procreation, should marriages of infertile or post-menopausal couples be annulled? Perhaps you're just fishing for a socially acceptable rationalization for your bigotry.
Homosexual behavior has been documented in over 1,500 species; homophobia in only one. Which is "unnatural"? Lifting the lid on gay natural history https://www.nwf.org/Magazines/Natio...onservation/Same-Sex-Behavior-Animals-Science The evolution of same-sex sexual behaviour in mammals
Bullshit. Never let bigotry be expressed in your presence without pushback. Be unreasonable about it. Silence equals assent. America, It's Time For Intolerance