If you need to belong, your group's morality will have a lot of leverage in your life. Relativity, not absolutism, can appreciate the nuances of diverse moralities. The existence of diverse sources of morality with their inherent contradictions, is primary evidence for moral relativism. Believing is universal, but particular beliefs are not. One fundamentalist moral perspective Morality's role is to directly constrain bad acts and impulses and mandate good ones.
True morality comes from a moral authority.
Moral truth is universal, absolute and sustained by faith and obedience. At its deepest levels, morality is eternal and unchanging. However, our moral authorities may mandate changes in the details and applications of it. There is only one right way. Conformity is vital.