Confucianism became the most influential religion in Chinese society and remained that way for many centuries. As you consider the question, notice that in classical Confucianism, there is no metaphysical foundation. In other words, the Way does not derive from some kind of conception of the universe or from some transcendent divine power. Instead, it is something humans create through their own intelligence and effort.
Your question: Does an orderly and ethical society require a metaphysical foundation? Why or why not?