I’m sorry but your view of history seems to stop at the time of the bible, which was written around 1450 B.C.
Here is a marriage ceremony that dates back to 2000 B.C.:
The 4,000-Year-Old Sumerian Love Poem and the Sacred Ritual of Marriage
Bridegroom, dear to my heart; goodly is your beauty, honeysweet; lion, dear to my heart. These are the passionate words…
“Historians say the words were recited by a bride of Sumerian King Shu-Sin, fourth ruler of the Third Dynasty of Ur, who reigned between 2037 and 2029 BC, and used as a script for a ceremonial recreation of the sacred marriage.”
The point is that marriage pre-dates religion. It is a human relationship that people choose to enter into. And the decision to do so is not dependent on arbitrary decisions by the Church or the State.
Do you have any other justification to control other people’s actions based on your religious beliefs, or are we done here?