I think getting from a goo of cells to what we are now is alot more complicated than a sand dune.

Yes. That's why natural processes take a few weeks or months to make a sand dune (and dunelike formations in powdery snow can take hours) whereas evolution takes about a billion times longer. If our poor ape brains were better equipped for visualising "a billion times longer" then there'd be less scepticism about this sort of stuff.

And if you ask me, zero to a goo of cells is the hard bit; goo to us sounds easy by comparison.

Peter