Of course marriage is government business, people can’t just decide that legal marriage is whatever they want.
I don’t want homosexual marriages and Islamic polygamy made legal in the United States.
Churches do not decide what marriage is or else the Mosques and satanic churches and homosexual churches would be in charge of defining marriage in America.
If marriage had remained a church matter, maybe more people would have been in a church often enough that there would not be any satanic churches or homosexual churches, just maybe more people would have had their children exposed to something other than that crap at an early age. But where there is nothing, something will fill the void.
But God gave us the choice to serve Him or not, the results will reflect that.
But, whatever the state says, marriage is between a man and a woman, in the eyes of God, and no Government has the authority to change that. Just watch, they are going to try, and it is because of the Government that God has been kicked out of so many public venues that the other ideas are gaining any toehold in our culture.
But look to your government for salvation if you must. You won't find it there.