Here are some links to get your brain juices flowing:
Study shows ancient relations between language families This article uses a lot of big words, but the drawing of the language branches shows it all!
“Primitive” cultures can still have the Most Complex Language in the World. The article is only a few paragraphs long, but thinking about such complex communication might make your brain overheat! Human language is always a complex thing and all people are created in the image of God.
Ancient Chinese writing, which is still plenty complicated today, was even more complex long ago:
“The general principles of construction of the Chinese written language have remained unchanged,” but variations have gone from “complex to simple construction, from irregular to stabilized forms, from formal to free lines, and from slow to rapid execution” (203).
If you look at the way people wrote long ago, they expected their people to be really smart to do the writing or even just to read it. These writings weren’t hidden where just the fancy people could see them either, they were often on the sides of buildings or even on special pillars so everyone could see them.
And God said, Let us make man in our image, after our likeness: and let them have dominion over the fish of the sea, and over the fowl of the air, and over the cattle, and over all the earth, and over every creeping thing that creepeth upon the earth.
So God created man in his own image, in the image of God created he him; male and female created he them.
And God blessed them, and God said unto them,… Genesis 1:26-28a
Dr. Walt Brown has a short page of quotes on Human Language in his online book In The Beginning.
For more on early language you could read this whole chapter from the book “Time and Eternity” by Arthur C. Custance, PhD: Part V: The Confusion of Languages
I’ve also written an article called Human Language for more.