Original sentence: Zuism or Sumerian-Mesopotamian Neopaganism define a modern Pagan religious movement based on the Sumerian religion (and later Mesopotamian religions which continued it), and calls itself the "oldest religion, foundation of all major religions"
Edited sentence: Zuism or Sumerian-Mesopotamian Neopaganism define a modern Pagan religious movement based on the Sumerian religion (and later Mesopotamian religions which continued it), deemed the "oldest religion, foundation of all major religions"