If you really, really believe that marriage is a religious institution, like baptism, or ordaining of priests and clergy, that’s fine. I say let marriage, as a word, be between you, your church, and your God.
But please don’t try and involve my government in your discrimination. If you want marriage to be religious, than our government should pay it as much mind as it does baptism.
Personally, I would fully support the government getting out of the marriage business. For legal purposes, call them all civil unions. The words you use don’t actually change my relationship one little bit.