Conservapedia's article on
marriage nailed it in the first sentence.
"Marriage is the divinely ordained union between one man and one woman."
Divinely ordained. Secular it is not. Oh, you want further proof?
"The first marriage occurred nearly 6,000 years ago in the Garden of Eden, in the area of the world that we now know as the Middle East. The first couple was Adam and Eve."
Master of ceremonies? That'd be God.