Yes, we all came from Africa and yet we all managed mingle, change and to develop distinct different cultures along the way. This doesn't make Greek, German, French or any other cultures rooted in Africa. They all originated somewhere along the way. Roots means the origin of a culture where it comes from and where it was first established. Considering the Greek culture was already established by the time of the war of Troy, it came from modern day Greece geographically to Anatolia. The ancient Greeks were seeing Troy as a foreign kingdom other that Greek, Heredotus and others write so.

As for the Huns, yes they disappeared and turned into different cultures like the Magyars and Bulgars. They are established as these culture where they are now, distinct from the Huns. They have historical ties to the Huns.

As for your culture of course you are entitled to your opinion, however writing in Greek doesn't mean your culture and the ancient Greek is the same culture. Anyways, I wish you a pleasant day and I hope I made my point clear.