The Supreme Courts Liberal Interpretation of Jefferson's letter was used to mistakenly uphold the materialist claim. History had shown for almost a hundred years, The US Government and "church" had very much been
UN-separated. All of this info is available on the Library Of Congress website, which thankfully the revisionists have not been able to destroy but my fear is it won't be long until these manuscripts and letters are locked away and forgotten.
"It is no exaggeration to say that on Sundays in Washington during the administrations of Thomas Jefferson (1801-1809) and of James Madison (1809-1817) the state became the church. Within a year of his inauguration, Jefferson began attending church services in the House of Representatives. Madison followed Jefferson's example, although unlike Jefferson, who rode on horseback to church in the Capitol, Madison came in a coach and four. Worship services in the House--a practice that continued until after the Civil War--were acceptable to Jefferson because they were nondiscriminatory and voluntary. Preachers of every Protestant denomination appeared. (Catholic priests began officiating in 1826.) As early as January 1806 a female evangelist, Dorothy Ripley, delivered a camp meeting-style exhortation in the House to Jefferson, Vice President Aaron Burr, and a "crowded audience." Throughout his administration Jefferson permitted church services in executive branch buildings. The Gospel was also preached in the Supreme Court chambers."
"On January 8, 1826, Bishop John England (1786-1842) of Charleston, South Carolina, became the first Catholic clergyman to preach in the House of Representatives. The overflow audience included President John Quincy Adams, whose July 4, 1821, speech England rebutted in his sermon. Adams had claimed that the Roman Catholic Church was intolerant of other religions and therefore incompatible with republican institutions. England asserted that "we do not believe that God gave to the church any power to interfere with our civil rights, or our civil concerns." "I would not allow to the Pope, or to any bishop of our church," added England, "the smallest interference with the humblest vote at our most insignificant balloting box."
"Charles Boynton (1806-1883) was in 1867 chaplain of the House of Representatives and organizing pastor of the First Congregational Church in Washington, which was trying at that time to build its own sanctuary. In the meantime the church, as Boynton informed potential donors, was holding services "at the Hall of Representatives" where "the audience is the largest in town. . . .nearly 2000 assembled every Sabbath" for services, making the congregation in the House the "largest Protestant Sabbath audience then in the United States." The First Congregational Church met in the House from 1865 to 1868."
Religion and the Federal Government, Part 2 - Religion and the Founding of the American Republic | Exhibitions - Library of Congress