Good, because I was also trying to clear up the confusion that the US constitution has a "separation of Church and State" clause. What it actually has, it seems, is a clause prohibiting the gov't from making religious laws. It cannot legislate what you choose to hold as your faith, nor how you practice that faith unless it conflicts with another section of the constitution. Thus rites involving child sacrifice, ritual killings, and polygamy may be discriminated against and made illegal, but not rites such as eucharist, unforced baptism, etc. And apparently you're allowed to think that the gov't is evil for outlawing your religion, unless your gov't has laws against particular sorts of unacted thoughts these days.
So then why does the State establish laws about and interfere with marriage, as it is practiced by religions? I haved suggested that it does so because the limit of your right to practice your religion is hemmed in by other people's rights to life, their own religion, and so on.
Imaginary State religion? Voice of Reason says that the state religion of the USA is Christianity and its variations. Not that I take him to be an authority on the subject, but people do seem to argue for the current marriage laws based on some conservative variation of christian religious doctrine. Your own religion, if I remember correctly, holRAB marriage to be a sacrement.
I suggest that unless someone's religion contravenes the law somehow, then in the USA it should not be subordinate to someone else's religion in the guise of law.
So I don't think that your objection, that such state laws must explicitly reference an official state religion in order to be religious laws, stanRAB because any law that is concerned with moral order rather than political order is implicitly religious. If you're enacting a law because men should only be able to marry women, and visa versa, then that is a law enacted from your own personal religious feelings and is the kind of law that your Congress is prohibited from legislating.