As is with the topic of this thread. You have clearly pointed to its premise.
The United States is founded upon natural human rights, and no religious doctrine. And as such, no religious doctrine ever be cited, or adhered to in any sense, or in any way by law, court ruling, or dictate in regards to the individual liberties of its citizens.
Your religious beliefs regardless of any issue, be it gay marriage, abortion, education, or anything else, has any weight or bearing on what any citizen may do.
As in getting married, having an abortion, or any other action regarding natural human rights.
In short, religion is irrelevant in the United States, and the only place it has any legitimacy at all, is your natural human right to practice it.
What you don’t have, is any right in that practice to effect the lives of others.