Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the government for a redress of grievances. (emphasis supplied)
Note that nowhere in the above are the words "separation", "church", or "state". How is it that the United States Supreme Court has been permitted to do what Congress cannot do?