"The proposition that the several States have no greater power to restrain the individual freedoms protected by the First Amendment than does Congress is firmly embedded in constitutional jurisprudence. The First Amendment was adopted to curtail Congress' power to interfere with the individual's freedom to believe, to worship, and to express himself in accordance with the dictates of his own conscience, and the Fourteenth Amendment imposed the same substantive limitations on the States' power to legislate. The individual's freedom to choose his own creed is the counterpart of his right to refrain from accepting the creed established by the majority. Moreover, the individual freedom of conscience protected by the First Amendment embraces the right to select any religious faith or none at all."