Marriage was created by God, marriage does not exist without a man, a woman and God.
Ecc 4:12 And if one prevail against him, two shall withstand him; and a threefold cord is not quickly broken.
Yes, and a ceremony which also represents the covenant between Christ and His church.
When two flesh become one, it is very clear husbands love your wives and wives honor your husbands.
So no matter what anyone calls it otherwise, marriage as ordained by God is one man and one woman.