Excuse me, uravip2me, but you are forgetting that were many different languages spoken in the ancient Near East in the 3rd millennium BC, which discredit your claims of one language prior to the Flood.
Sumerian is a good example of non-Semitic language, spoken as far back as the late 4th millennium BCE. There are evidences of Amorite people living in much Syria and Levant, as well those living in Mesopotamia. According to the Bible, the Amorites were descendants of Ham and Canaan, which is nonsense by literary evidences of the Sumerians. How could Amorites be descendants of Ham, if the Amorite people lived prior to the Flood? And Abraham was supposedly the father of Semitic languages, and yet how do you explain the Amorite language?
Ancient Egyptian was also spoken as far back as late 4th millennium BCE, and like Sumerian, non-Semitic language. Again, according to the Bible, Egypt was supposed to be also son of Ham.
So how could Egypt be a son of Ham, if Egypt existed centuries before the Flood?
And then there is the city, Uruk. According to the Bible, it was founded by Nimrod, and yet historically and archaeologically, Uruk have been around centuries, and even prominent before the Bronze Age (4th millennium BCE).
Other than Sumerian, Egyptian and Amorite languages, there are Elamite, Eblaite (Semitic), Cretan.
So excuse me if I don't believe in this so-called one language of yours.