However, the framing of the issue is often misconstrued to be one of an individual, most often a homosexual, "redefining" marriage. That is not the case.
Actually, yes, it is the case. Marriage has always been defined as the union of a man and a woman: as long as the institution has existed it has been defined this way. Homosexuals are not prohibited by any law from engaging in marriage: they are legally free to enter into a marriage just as you or I am. The problem is not that they are prohibited from marrying: the problem is that they want to change the meaning of that term to something it has never meant. So, yes, my point is true.
The issue is that the state essentially "redfined", or rather, limited the definition of marriage which denied the civil right of marriage to certain persons.
No, sir, that is not true. The state merely acknowledged the existing and long standing meaning of the term. Nowhere is there any suggestion that the state decided what a marriage meant; they merely acknowledged the existing meaning of the term. And the privilege of marriage is available to any adult citizen with normal mental capacity.
Now to address the original issue:
I'm presuming here that you equate marriage, as a 'civil right' with the constitutional rights (partially listed in the Bill of Rights)? -That's correct.
If one asserts that marriage is a fundamental human right, the same as the ones listed in the Constitution, then you are in a quandary. Where exactly do those rights come from? That is, if I have a fundamental human right to marry, then where did that right originate? According to the Founding Fathers those rights are granted by our Creator, God. However, if the right to marry is God-given then we do not get to change what constitutes a marriage; we are endowed with the right to engage in marriage as God describes it.
The point here is that we do not get to invoke God given rights, and then change the meaning of those rights at a whim. Either this is a God given right, and we must adhere to His understanding of it; or it is not a Right, and we are free to redefine the term if the majority of society so chooses. But we cannot have it both ways.