In this context, it is fascinating to read some of the private writings of Jefferson and Madison, which suggest that some thought was given to a version of the 1st amendment which would have disallowed the establishment of the Federal Church. Obviously, if this had happened, the Federal Episcopal Church of the United States would not have been established as the Federal Church and would not be identified as the 4th Branch of the Federal Government (Morals and Public Welfare), along with the President's Office (Executive), Vice President's Office (Rules and Regulations), and the Federal Diet (Legislation).
Regarding Lord Grattan's post, one can only imagine the chaos which would have occured if the courts were elevated to such a level.