Since no one addressed the concerns of getting government out of marriage, I will give my two cents on the topic. Viviane, feel free to spew hate or vitriol at me if you disagree.
I think it absolutely is the business of government to ensure that all people are given the rights they are entitled to.
Yes, but if government IE the state is not involved in the institution of marriage and instead protects the freedoms of individuals to marry who they want then it is indeed doing the job of ensuring rights people are entitled to. Now, having said that I suppose it would only be fair to limit marriage to two (or more) consenting adults.
By saying that government should stay out of it, the default position for that is...what? that religion should concern themselves with the legalities of marriage?
Marriage would be little more than a contract between two (or more) consenting adults. The contract would spell out mostly the financial obligations as well as child custody in the event the marriage contract is dissolved. It would be enforced the same way any other contract is enforced.
As far as the religious ceremony, that would be up to the adherents of said religion. If a Catholic wishes to be "married" in a Catholic church then of course he or she should adhere to the church's teachings. However, that is for the individual to decide and has no bearing on the marriage contract that the partners enter into voluntarily.
If it isn't the business of government...then tell me, whose business is it? Who is going to stand up for the rights of the minority??
How would the minority have their rights trampled on given this arrangement?
Who would decide child custody cases and divorce disputes over property?
This is spelled out in the contract and enforced like any other contract.