I think you are twisting the meaning of some posts. For those that wish to lead a religious or spirtual life, the morals that guide them are usually highly principled and good. Those principles are goals, which all fall short of. They are not a way of claiming a higher moral authority, which seems to be your implication.
Goals remind us of our aspirational objective and help to devise a plan for success, as opposed to just do things without a whole lot of thought.
Do you have to be spiritual or religious to lead a principled lifestyle? No. But, the principles of religious doctrine certainly are a way of providing that to many people, and therefore improves the likely of acting morally compared to someone who has no guiding principles.