DNA studies determine the Greeks traced their origins to ancient Anatolia, yes, same place Gobekli Tepe is at....

[link to www.iflscience.com]

"Scientists have now obtained and analyzed the genome of ancient Mycenaean people and found they are strongly related to modern Greeks.

Digging further back into the genome, the Mycenaeans were also shown to be related to the Minoans, a Bronze Age civilization on the island of Crete, which flourished before Mycenaea. The Minoans have often been declared the first proper civilization of Europe, who led the way for the Mycenaeans to enter mainland Greece and eventually become the famed Classical Greeks.

This trail of genetics doesn’t end just there. Around three-quarters of the Mycenaeans' and Minoans' ancestry originated in Anatolia, present-day Turkey. The remaining quarter can be traced back to the Caucasus, near modern-day Iran. Modern Greeks, in turn, can trace their ancestry back to here.

"Minoans, Mycenaeans, and modern Greeks also had some ancestry related to the ancient people of the Caucasus, Armenia, and Iran. This finding suggests that some migration occurred in the Aegean and southwestern Anatolia from the further east after the time of the earliest farmers," lead author Iosif Lazaridis said in a statement."

50%

It was told by the Sumerians themselves that they traded with the Kingdom of Aratta before Sumeria blossomed into a full fledged civilization. It's clear that Aratta was a predecesor of Sumer. Then we have the Minoans who were the predecessors to the Greeks coming from the same Anatolian root as these Arattans. The Greeks being the predecessors of the modern day western civilization we form part of. If you really follow the thread to the beginning, civilization in the west has come from the same line of people who were most likely themselves survivors of a pre flood civilization that already existed since who knows how much earlier.