You're mistaken. Metaphysics is derived from the Latin word metaphysica, meaning beyond the physical. It deals with things that are beyond our senses, so it is not a misuse to describe things such as logic as metaphysical.I think you are misusing the term 'metaphysics'. Metaphysics is a branch of philosophy having to deal with 'being' and existence; ontology.
How is your moral position superior to mine? How do you know that a "peaceful community" is good? How do you determine what is evil? All these questions demonstrate the folly of your worldview, due to it's subjectivity. You can't have a subjective standard and argue superiority, that dog just won't hunt bro.Ethics (morality) is also a branch of philosophy. If you want to ask "what is good or bad" that is morality. If you ask "does good and bad exist objectively" that could be bringing-in metaphysics into the discussion. Another metaphysical question would be "do numbers really exist, or are they just a human conception?"
For morality, you are probably following what is known as "Divine command theory." I don't. I look to consequentialism, individual rights, and reciprocity. No god needed. The three things I listed have the effect of making a peaceful community. If you want to discuss further, pick a certain moral subject, but some are hard and some are easy; not at all "one size fits all." By the way, most brilliant thing ever, written on morality:
"The Moral Instinct" by Prof. Steven Pinker
Besides, the real reason you are concerned about morality to begin with is because you were made in the image of God. Scripture says that you know God exist and that you suppress that truth in unrighteousness. I can give an account for these things through the Christian worldview. Atheism can't.