Are there non-religious traditions that acknowledge "absolute goodness?"
Here are a couple approaches:
Objectivism considers there to be such a thing as correct and incorrect moral choices, and happens to originate from an atheist.
Descartes took only his own existence as axiomatic, and from that used only reason to derive moral right and wrong. Of course, he happened to be religious, but I non-religious people since have taken similar approaches.
Isn't ethics about justice?
If you read about ethics and justice, you will see that justice is only a part of the study of ethics, but it is obviously an important part and it is difficult to discuss ethics without discussing justice. If
Normative ethics involves arriving at moral standards that regulate right and wrong conduct.
then it's difficult to discuss right and wrong conduct without discussing what other people are due.
"Moral theories" that don't assume some virtues are absolutely good but can help deciding "What do I do?" in real human affairs?
All moral theories I know are entirely about how to decide what to do in real human affairs - Christianity, Marxism, Stoicism, Consequentialism, Libertarianism, Socialism, etc., all make claims about how we should order our lives and how we should make moral decisions. Some take virtues as their starting point, others start somewhere else but arrive at something much like it. I would challenge you: is there such a thing as a moral theory that doesn't say something about what to do in real human affairs?