At what point did humans become human?
I guess from a religious standpoint it doesn't matter, since we know it happened at some point and for believers according to God's plan and input.
From a scientific viewpoint it's an interesting question, but since no human witness was there and there's no recorded human history 'before' we were human, no one really knows.
Modren science provides us with some clues though....As I understand it modern genetic and DNA tests have proved that all existing humans are the descendants of 1 woman who lived 150,000 years ago, and also the descendants of 1 man who lived about 100,000 years ago. So, science has proved an 'Adam' and Eve', although they didn't live at the same time, never met, and didn't live in a garden.
Science also now knows 'humans' left Africa and moved to what's now Arabia c.58,000BC and from there and the Mideast spread to every part of the world by 16,000BC.
Religion and Jewish legend from the Mideast (Genisis chp. 6) talks of the 'Nephilim' (mis-translated by the Greeks as 'giants') who lived in some parts of the Mideast after humans were created, and who were like humans, stronger, but not human....and now thought to refer to the Mideast Neanderthals of c.40,000- 30,000BC. According to legend and Genesis these people lacked human souls or had limited human souls and were not 'God's' humans.
So, I guess humans became human 150,000-100,000 years ago, finishing up being totally human after a little interbreeding with the Neanderthals about 35,000 years ago.