Earlier quoted context omitted.
Or maybe, just maybe, ethics isn't at all universal? If my time in other countries has taught me one thing, it's that different people and different cultures have very different ideas on right and wrong. Ultimately (like, really ultimately), the very idea of ethics is a meaningless fabrication in the absence of God. Without an ultimate arbiter of truth, morality cannot exist.
I think you might find some intro philosophy useful to understand how you can have a universal morality without a deity. Some Kant is a good place to start, with his universal law being a fundamental idea.
I never liked my ethics classes. Phenomenology and existialism is my shit, though I suspect Husserl was the inspiration for GPT-3.