I wouldn't consider the National Anthem or Pledge of Allegiance as "founding documents, but you're wrong about the mentions of God.
Certainly, "one nation under God" seems to be a fairly controversial part of the Pledge...
And the National Anthem?... It's convenient that you leave out the last verse. I really could care less if you have never heard or sung it before, but it's pretty clear what it refers to...
As for the COTUS? It's a governance document. It simply sets up the process.
And quite interesting that as far as Founding Documents go, you left out the Declaration of Independence.
Anything to further the narrative, right Tree?