God defines marriage, not the State. Any “marriage” a State defines is just as much as legal fiction as when it tells us that a corporation is a “person”.
Jesus tells us that from the beginning of humanity, it was God’s intent that marriage would only be one man and one woman. Scripture in many ways and places also tells us that God defines sexual morality and that people who refuse to practice that morality cannot qualify for the freely given gift of eternal life.
The State attempts to force us to recognize its power. One way is to presume the power to define who is married and who is not. We cede this power in part because we allow the State to tax incomes and estates, so to administer such taxing power, the State must define who it considers to be “married” and who is not. Just as when it defines a corporation to be a “person”, the State does not hesitate to define anyone it pleases as being “married, totally apart from how God would define it.
If you review the arguments advanced by supporters of same-sex marriage, you will find that a lot of them are related to taxation, inheritance and medical issues. But existing law addresses those and any defects in the law can be easily repaired apart from the issue of “marriage”.
I don’t want a government that can tell me what I may or may not do in the privacy of my own home or relationships. In a Constitutional Republic with a provision that prohibits Congress from making any law respecting religion, I have to allow others to have their own beliefs and morality. I can only be an advocate for the morality and beliefs that I think are true. I take my understanding of sexual morality from Scripture and that is where I learn that God considers sodomy to be an abomination.
If a State decides that two (or more) people can marry, if that is all that happened, I could live with that because I don’t have to approve, change my beliefs or what beliefs I pass on to my children.
However, once gays have sufficient influence with a State to redefine marriage, gays don’t stop there. They use the State to forbid me from acting on my morality and beliefs. In fact, the State in some cases forces me to accommodation in their practices.
If I have children in public school, the State will insist on teaching them that gay marriage is just as normal as godly marriage. You will be sanctioned as a parent if you attempt to remove your child from such indoctrination.
If you run a business that could provide services to gays, you will be sanctioned if you decline to treat them as any other customer. For example, if you run a wedding photography business, you will be sanctioned if you decline to photograph a gay wedding.
In short, gays will jam their lifestyle down our throats because when the State says they are equal it is forbidden for a private citizen to dissent from that status. In doing so, they seek to force me to give them approval for something that I will never approve of. It is that last point that galls gays the most.
Curiously, when liberal advocates of gay marriage are asked if their policy also would allow polygamy or polyandry, they recoil in horror and insist that it does not. However, logic demands that it does. I would ask how same-sex parents are going to react in the future when Utah public schools insist on indoctrinating the children that LDS-related polygamy is just as “normal” as same-sex “marriage”. The fact that this will be an issue will show yet again that gay “marriage” is not about marriage at all, it is about forcing the rest of us to approve of repugnant sexual immorality, something that LDS polygamists never demanded.
That about sums it up.