Poirot, spirituality comes in many forms, but they are all essentially about one question: "how can I be a better person?". Usually that involves how to behave better towards others with the reward of increased personal well-being.

Whatever works is good, I think.

Antiseptic,

Yes, I soon realied that “taste” was not the right word to use. There is something deeper than just “taste” that makes me detest, even abhor, Mengele’s praxis and Singer’s recommendations. Though I do not know much about ethics, I know there are moral philosophers who reject Singer’s utilitarianism, if that is what it is, as well. Perhaps I am in a similar position as non-physicists whose only argument against superstring theory is that there are physicists who also reject it.

For the rest of your post, I shall have to think about it, since though outside my field it seems to provide an interesting analysis and insights.