You seem a little confused. We are all evolved from Homo Erectus.
Cladogram of Homo erectus
Certainly not from Ardipithecus ramidus. They were a dead end and none of their remains have have ever been found outside the African continent.
Phylogeny of Hominina/Australopithecina
What are you even attempting to argue and where would you place the beginning of humans? It all depends on what criteria one stipulates, doesn't it? How far do you want to go down the phylogenetic tree? One could argue that it is the point at which microorganisms first appeared somewhere between 3.77 and 4.41 billion years ago.