Marriage is BOTH. Two separate entities, one religious one legal.
But they are entirely different animals, are they not?
Calling the legalistic, bureaucratic bond "marriage" is putting a relgious term at the mercy of temporal whim.
If this licensed affair were tied to the religious, then we wouldn't have to deal with its perversion into "gay" marriage. TRUE "MARRIAGE" IS MAN AND WOMAN, no matter what your legal definition says.