The criterion that assures unity amid the diversity of liturgical traditions is Question 15 options: fidelity to the improvisational spirit, i.e. the gift of the Holy Spirit within each preacher and congregation. diversity within the demographic characteristics of the individual congregation who worships. demographic diversity among the clergy who represent Catholics around the world and lead the worship service. fidelity to apostolic Tradition, i.e., the communion in the faith and the sacraments received from the apostles, a communion that is both signified and guaranteed by apostolic succession