This is one of those discussions that we will never really find an answer to yet always amuse me.
As a rather long in the tooth ex scientist Ive never really understood how everything we see around us is basically produced from the same relatively small selection of elements chemically combined in a myriad of combinations.
Our bodies are made up of multi thousands of very different, very complex compounds, many of which our best research laboratories would struggle to synthesise, yet our bodies turn them out at will in usually just the right concentrations to keep us fit and well.
Our mind, whatever that is, seems to be a highly complex mess of electrical impulses somehow put together by another mulch of randomly produced chemical compounds (our brain).....trying to analyse these would make Bill Gates look like a complete amateur.
I reckon I probably have the best part of 50 billion (only a guesstimate) atoms randomly assembled into hundreds of thousands of different simple and complex compounds forming...."me".
All of this has taken place without any input from our collected human intelligence, these little atom chappies just go about their business as they see fit.......whatever makes us think we could ever get to the bottom of why we are who we are??
I know for one, I gave up worrying about it long ago......just my thoughts