Ok, that video was obviously a joke in the first 5 seconds because he's giving the explanation for why each premise doesn't make sense.
He has one good point which is that America has "freedom of religion," so maybe according to his religion, men having sex with each other is considered a good deed, while procreation is "evil." (or maybe he believes sodomy is a neutral act). He may be incorrect objectively, but America as a country allows him that belief. On that basis, he should be allowed to have sex with a man according to his religious beliefs.
But he does not address that marriage itself has a definition, and he is trying to expand the definition. He wants to call french fries a burger. Who says that the definition should be expanded to include pairings of the same gender?