If you are objecting to Gay Marriages because of your Biblical understanding, why are you not also fighting to outlaw other marriages that the bible forbids ?
Example can a Non Christian Marry a Christian Legally according to you ?
Exodus 34:10-16: "And he said, Behold, I make a covenant: before all thy people I will do marvels ... behold, I drive out before thee the Amorite, and the Canaanite, and the Hittite, and the Perizzite, and the Hivite, and the Jebusite. Take heed to thyself, lest thou make a covenant with the inhabitants of the land whither thou goest, lest it be for a snare in the midst of thee: But ye shall destroy their altars, break their images, and cut down their groves: For thou shalt worship no other god: for the LORD, whose name is Jealous, is a jealous God; Lest thou make a covenant with the inhabitants of the land, and they go a whoring after their gods, and do sacrifice unto their gods, and one call thee, and thou eat of his sacrifice; And thou take of their daughters unto thy sons, and their daughters go a whoring after their gods, and make thy sons go a whoring after their gods."
Deuteronomy 7:1-6 "Neither shalt thou make marriages with them; thy daughter thou shalt not give unto his son, nor his daughter shalt thou take unto thy son. For they will turn away thy son from following me, that they may serve other gods: so will the anger of the LORD be kindled against you, and destroy thee suddenly" (v. 3-4).
Why allow one but ban the other ?