“Religion declined not because it was refuted, but because it became irrelevant, dull, oppressive, insipid. When faith is completely replaced by creed, worship by discipline, love by habit; when the crisis of today is ignored because of the splendor of the past; when faith becomes an heirloom rather than a living fountain; when religion speaks only in the name of authority rather than with the voice of compassion—its message becomes meaningless.”