donnA--you are being blinded by your poor understanding.
In our state of Colorado, at least, common law marriage is legal marriage.
You do not have to "shack up" first for there to be a legal marriage.
You do not have lie.
All you have to do is state that you are married to each other. You can THEN move in together.
It is just as legally binding as any marriage, with all the rights and responsibilities including the necessity of divorce.
Couples that live together and state they are NOT married, even if they have been shacking up for 50 years, ARE NOT MARRIED.
Couples that are not legally impaired from marriage (already married, underage, etc) and declare themselves married ARE MARRIED even if they have not yet moved in together.
Also, if you choose to go get a marriage license, in our state you may sign it and in front of witnesses marry each other, without need of judge or clergy, and YOU ARE MARRIED.
The idea that a ceremony is required goes back to Catholic church mumbo jumbo. Unless the priest does it, it isn't real. Folks took that and made any licensed and ordained clergy acceptable. Non church and non Christian folks were left out so judges and court clerks in some places were added.
You can see the same thing with church membership. Some petty power hungry folks want to limit who's in and who's out. Unless "we" decide you can play you cannot play.
But you know what? Jesus actually warned us against this religious type of person.
God calls people to Himself. God saves them. And when He does they are part of His church.
You don't get a much higher official for the ceremony than that.
That's why at cowboy church if you want to be respected as a member you live it out daily. You respect people. You help people. You share Jesus. You live a life of thanksgiving. You don't argue religion. You don't judge people in respect to their understanding of the Bible.
And it gets us in trouble with the religious type, but we usually assume "fighting fundamentalists" need a good dose of God.
We are a far from perfect, far from consistent group of people. But we figure formal church membership is meaningless if you are a cantankerous old goat, and unneeded if everyone in the community can see you love and follow Jesus.