Hebrews, Sumerians, Tamils and Japanese
The Japanese language is an agglutinative language like the Tamil language spoken in Southern India.
Another interesting thing is that Sumerians also spoke an agglutinative language more than 4,000 years ago.
The Bronze Age began 2,500 years ago in the Sumerian world in Mesopotamia. However Mesopotamia produced no copper and tin. Copper was imported to Mesopotamia from Iran and coast areas of the Persian Gulf. However, tin was imported from West Afghanistan through the Gulf as with lapis lazuli, blue precious stones.
Sumerians especially attached the importance to a location in the Persian Gulf called Dilmun.
Dilmun or Telmun was a civilization in Eastern Arabia. Dilmun was an important trading centre which at the height of its power controlled the Persian Gulf trading routes. The Sumerians regarded Dilmun as holy land. The scholarly consensus is that Dilmun encompassed Bahrain, Kuwait, Qatar and the coastal regions of the Eastern Province of Saudi Arabia. Dilmun was mentioned by Mesopotamian civilizations as a trade partner, a source of the metal copper, and an entrepôt of the Mesopotamia-to-Indus Valley Civilization trade route.Dilmun was a relay point for trade between Mesopotamia and India.
Taking all these factors into consideration, it is thought that Sumerians came to Mesopotamia from South India along with trade between Mesopotamia and South India. The ancestors of Sumerians in South India must have been close to ancestors of Tamils.
And in a wider scope, some ancestors of Japanese and ancestors of Tamils/Sumerians must have been close to one another.
On the other hand, as Abraham came out around the Sumerian capital Ur, it is naturally thought that Hebrews were rooted in Sumerians. In this context, Judaists, Tamils, and Japanese of today are regarded as descendants of one original language group of the ancient world established after mankind exited Africa 60,000 years ago.
In terms of DNA, it is uniquely confirmed that the size of Y chromosome is the same between Japanese and Judaists of today. However no other linkages have been confirmed between Japanese and Judaists of today, though some Japanese share part of DNA with Tibetans rather than Tamils. But today we cannot find any descendants of Sumerians in the Middle East; Sumerians were absorbed by Arabic tribes. Sumerian Hebrews must have been also absorbed by Arabic tribes, adopting an ancient Arabic language. You cannot simply deny the above presented theory.
A theory linking Sumerians to Japanese, though a little too quixotic
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Luk 7:21 And in that same hour he cured many of their infirmities and plagues, and of evil spirits; and unto many that were blind he gave sight.