"The Constitution of the United States guarantees liberty of conscience. Nothing is dearer or more fundamental. Pope Pius IX, in his Encyclical Letter of August 15, 1854, said: `The absurd and erroneous doctrines or ravings in defense of liberty of conscience are a most pestilential error--a pest, of all others, most to be dreaded in a state.' The same pope, in his Encyclical Letter of December 8, 1864, anathematized `those who assert the liberty of conscience and of religious worship,' also 'all such as maintain that the church may not employ force.'" {GC 564.5}