This country was founded by gentlemen who paid public homage, or didn't, to biblical teachings, married, and then went on to sire untold numbers of offspring with the slave women that they held. The founders of this nation, were incredibly clever, and The Constitution is a masterpiece. Do not confuse this with any sort of personal moral imperative on their parts, or hundreds of years later rummage through questionable middle eastern history texts, and try to suss out what our Founding Fathers meant. The Constitution is what they meant.
The states determine the age of consent. That varies wildly, Utah polygamists are moving to Texas, where the age of consent, is thirteen. The Utah laws regarding consent are more detailed and stringent that that.
If we can apply ourselves to determining what are our inalienable rights, as regard life, liberty, and the pursuit of happiness, then we will be far ahead.
Our Founding Fathers meant for there to be a strict separation of Church and State, they said so, for very good reason.
Find the victim, and legislate against the crime. If it is illegal for gays to marry, because of questions surrounding their parenting modes, then shall we also sterilize gay people? That is the next step. Shall we incarcerate them, that does still happen, there are laws on the books that make gay behavior illegal.
How can we as a society, realize there is a stable, long standing population of Gay individuals, and ask they they just stay under the rug, and everyone will be more comfortable? How can we rationalize destabilizing their potential for long term happiness, and validation, while decrying the aids epidemic, that exists in every type of "player" population? If schools advocate celibacy until marriage, then are they advocating that gay teens, and young adults, simply stay celibate over their lifetimes?
I think that the gay marriage amendments passed, because of the amazing budget that was available for the RNC to use, to further entirely other political aims. The anti-gay marriage thing, was like an amendment tacked onto a pork barrel bill. In states where the little punch cards are still used, you could symbolically wound the gay people you dislike with the card punch.
The entire defense of marriage ideation, was a way to soften the image of intolerance these amendments present. See, you aren't being a bigot, you are protecting marriage. It is kind of like a "Protecting The Water From Ducks", legislation, that results in an unlimited open hunt, until every last duck is either dead, or relocates to a different pond, in a different nation. This is seriously unfriendly "Duck" legislation.
So, a bunch of people are hurt, so another bunch of people can feel right. Then an entirely different group of people, make a lot of money, and don't care a fig about whether gay people marry or not.
I remind that the children of gay parents, are hurt in this. Gay young people, and gay older people, are hurt in this; so that people can feel right. You have to ask, what is right about denying a life, to people?