not trying to get in a religious argument here but..
1) kind of hard to have absolutely 0 influence on the way the country is run when our country was founded on it and it's in our documents
Our nation was founded on the fundamental truths of life, liberty, and the pursuit of happiness (changed from "property" under John Locke's estimation). It was not founded by religious people. It was founded by Deists (Benjamin Franklin, Alexander Hamilton, Thomas Jefferson, George Washington...all Deists). They believed in a clockmaker god who set the Universe in motion, but didn't take an active role in daily life. So no predestination, salvation, etc. At least in their minds.
2)everything you mentioned was in the old testament and are not required to be followed anymore by christians.
Nothing has to be followed by Christians. That doesn't make sense. If anything had to be followed, that would undermine the Christian idea of free will. Besides, the Old Testament is still relevant, and many extremist Christians do place the basis of their beliefs on it. Is it unfair to cite? Probably. But then you cannot cite it either. Where in the New Testament is a "right to marry" specifically defined as "belonging only to a man and a woman engaging in a heterosexual relationship with the intention to procreate"?
This is totally disregarding the fact that we're referring here to legal matrimony. Not religious matrimony. Religion is not a part of this; Churches would still be totally free to disregard or refuse to recognize same-sex marriage. That's protected under the First Amendment's "free exercise" clause. We're talking here about legal matrimony, which is very different and has very different purposes. Its purpose is to establish certain tax and visitation benefits, as well as adoption procedures and other things. Nothing do do with procreation whatsoever.
We simply cannot utilize religion when adjudicating our laws. It's a violation of the First Amendment "establishment" clause, barring the "establishment" of a religion. The moment we adopt laws that define marriage on the basis of a religious argument, we have violated the Constitution of the United States of America.
Thus, religion is not a part of this argument.
just wanted to point that out...
So, in conclusion, perhaps we need to define our terms here...
Religious Matrimony is issued by Churches and only by Churches. It is the exercise of the idea that a man and a woman wed in order to procreate. It is a mutual, loving commitment.
Legal Matrimony is issued by the State and only by the State. It is the exercise of the idea that two individuals wed in order to establish certain benefits. It is a mutual, loving commitment.
The two ideas are exclusive to one another. They do not intersect. And the issue at hand in the same-sex marriage debate is Legal Matrimony. Not Religious Matrimony.
Sorry to reply in bold. It as easier to embolden my text than his.