The state has no business "licensing" an institution ordained by God...licenses came about during the days of slavery to keep the races from intermingling.
I always find it amusing when "conservatives" who believe in smaller government, less intrusion of government, free-market capitalism and all of that, suddenly call for an intrusion of government to stop behavior that not only doesn't affect them personally, but is only abhorrent to their own culture. Especially as a member of the Religious Right (tm), I feel somewhat conflicted when this happens. I'm gonna stick to my guns on this one, though, since it is consistent with my principles. Homosexual behaviour is wrong, but it is not the role of government to decide this. The government is there to enforce laws. Those laws are put in place in order to protect the rights of the people. You can't steal because it denies property rights to others. You can't murder because it denies the right to exist to another person. You can't recklessly endanger others. However, you can have friendships, associations and sex with whoever you choose. But don't destroy the rights of other people. I can't see why this is hard to understand.
If you use this issue to assert your majority will, in direct conflict with the Constitution article 9, don't whine when the left forms its majority over something near and dear to your heart and yanks your righteous indignation right out through your ear, okay?
Here's a list of potential issues you might just have to deal with if you set a legal precedent of government intervention:
Parental rights will disappear and be replaced by the discretion of the State.
Derogatory speech which APPEARS to be directed at racial, socioeconomic groups, or other protected groups will be criminal.
Your right to worship as you choose will disappear, and the Bible will be replaced with a more tolerant and even-handed version.
All behavior deemed offensive to any group will be outlawed. These behaviors include spanking, prayer, wearing of religious ornaments, use of opinionated or poignant bumper stickers, uppity black people supporting conservative causes, gun ownership, action movies, nudity (of womyn), heterosexual intercourse (see rape), marriage, motherhood (see white slavery), public opposition of marxism/leninism, consumption of fatty foods, smoking, Atkins, cheesecake, candies, Valentine's day, Father's Day, Christmas, Yom Kippur, Hannukkah, Veteran's Day, Memorial Day, Capitalism, Entrepreneurship (see Capitalism), loud music, Sport-Utility-Vehicles, gasoline, CO2 production, breathing, passing wind, lumberjacking, camping, hunting, fishing, zoos, meat, animal husbandry, eggs, fish, poulty, fur, Roy Rogers, Huckleberry Finn, abstinence education, pastries, clothes with mixed fibers, plastic, glass, and the miniskirt.
I don't want to live in that world. If you do, kindly move to Antarctica and create it there.
Licensing of Marriage became a civil institution because of Luther and the Reformation. Before the Reformation Marriage was a religious rite and divorce was condemned.