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If you mean that people should be married by the state, that goes against separation of church and state. Marriage is a religious word that the state has no business using. As long as you keep the word marriage in the government, people will get upset and have a right to vote on state issues.
Removing a word that is sacred to many, takes the dog out of the fight. It separates religion from the issue of Gay rights. I would think that would be useful to further your agenda.
From ignorance of church history and of Puritan history, it is easy to come to the wrong conclusion. Let me help correct that ignorance.
The early church performed blessings for couples. It was not a sacrament for hundreds of years.
Christ did not participate in the marriage where the loaves and fishes fed so many. If anything, Christ made it a sacrament for the reception.
The Puritans, when establishing the Bay Colony (soon to become Massachusetts) specifically made marriage a secular, governmental affair. They established the tradition we have today of allowing clergy to marry couples but maintaining government control.
There is NO sacrament in legal marriage today - it consists of an oath of the couple, witnessed by an agent commissioned by the government to perform marriage who duly records it for government use.