Ancient civilization attributed the original of writing to the gods.

IELTS Writing 6: Summary Origins of Writing

Ancient civilization attributed the original of writing to the gods. Ancient Mayans, Sumerians, and Assyrians believed writing original with certain gods. Humans began painting pictures on cave walls 25,000 years ago or more. Writing systems developed independently in at least three different parts of the world: Mesopotamia, China, and Mesoamerica.

The oldest writing systems developed among the ancient Sumerians in Mesopotamia around 3000 B.C. The oldest form of China writing was around 1500 B.C. It called oracle bone script because it was carved on animal bones and shells. The Chinese writing system was also the original basis for both the Japanese and Korean writing systems. In Mesoamerica, ancient Mayans, scholars believed that writing in that part of the world may have begun before the rise of Mayan civilization.

Today, three-quarters of the world's adult population can read and write, and literacy in considered a basic skill necessary to function in the modern world.

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Hello! Here is my correction:

Ancient Mayans, Sumerians, (you can take out the comma) and Assyrians believed ...
...: Mesopotamia, China, and Mesoamerica.

I would advise you to use more connectives. For example:
... in Mesopotamia around 3000 B.C., meanwhile the oldest form of China (...) 1500 B.C. and it was called oracle bone script ...

Hi MJT
Let me give you some advice to improrove you writing skills in the future...

(Some civilizations like) Ancient Mayans, Sumerians, and Assyrians believed (that) writing original with certain gods.
(Later,) Writing systems developed independently ...
... in Mesopotamia around 3000 B.C.(Otherwise,) The oldest form of China(Chinese) writing was around 1500 B.C.

Many sentence are disconnected with other sentence because you dont use your own word in this summary
It will better if you use your own word
Thank you and keep writing...

Hallo there, I want you obtain some suggestion from me, here we go:

Ancient Mayans, Sumerians,(you should use coma symbol before "and" when object you say more than 3) and Assyrians believed writing original(in my opinion your phrase is uncommon) with certain G ods (Gods or God should be start in capital word) .

The oldest form of(please check your grammar) China writing was ...
note: please you can do it more than that, please phrase and replace many words to avoid plagiarism from the original essay. carry on!