The Establishment Clause stands as an expression of principle on the part of the Founders of our Constitution that religion is too personal, too sacred, too holy, to permit its 'unhallowed perversion' by a civil magistrate.
The First Amendment has erected a wall between church and state. That wall must be kept high and impregnable. We could not approve the slightest breach.
No person can be punished for entertaining or professing religious beliefs or disbeliefs, for church attendance or non-attendance.