In my point of view, to know our creator, we have to learn about ourselves. Those are something in this world, we can not explain it well. It is like air which cannot touch and even see  but we fell it. 

Anyway, just believe what you want to believe. 

Sincerly. 

Up to date, there is no any compelling evidence to let me consider which theory is absolutely right and I am inclined not to pay too much attention to these assuptioms which have not been approved by scientific moethds. By the way, an intriguing thory claimed that we all are aliens' descendants far from Galaxy but without sake our ancestors have lost their shuttles to travel back their original planets.

Well,it's an interesting question.As far I know,there is no concrete evidence of location where human first appeared.But yes,as per our discovery till now, Africa is considered as the cradle of first human appearance.As first there was only one land mass called Pangea surrounded by a sea called Panthalassa.And later according to continental drift theory,landmass got divided into many parts.So it may be possible that prior to this phenomenon, the human would have spread all over the land mass( It is just my thought):)

Now in my country(India),some consider that we belong to Aryan race and some to Dravidian race.As there was a civilization called Sindhu-Valley civilization was present here and there is much evidence found by the archaeologists.And some say the  uprooting of that civilization was due to the attack of Aryan( they are considered as the nomadic tribe from central Asia entered into India through Hindukush mountain  )and some say that the cause is due to flood in Sindhu river.A person called Max Muller, a philologist and orientalist best explained the origin of Aryan race(You may take a look at his theory)and many more.There are many myth or theory(you can say) about how civilization in India was came into existance but we all know that those are not the concrete proofs.So for this time being we simply have to believe on those theories.But I think we landed from some another planet as God wanted us to fell his lovely and beautiful creation:):)Please correct me if I'm wrong.Thank you:)