Hogwash.
The Declaration is our national charter. It is the first part of the organic laws of the United States, codified.
Saying it is not the law in America is like saying that the foundation is not part of a building.
You are sadly mistaken.
It USA credo. It is a list of grievances. It is a thumb of the nose to the King.
Things in it might have been codified. But it is far from law.