Therefore, She needed another merit system, to replace Heaven's Merit.
As for Empress Nuwa, who had the blood of Primordial Divine Demons, she definitely did not appreciate the Heavenly Merit.
Because she wouldn't get any of it either.
She had no inherent connection with Pangu.
So she also hoped that another merit system could replace the Heavenly Merit.
Uncle did not need it either. He belonged to the family of the deceased Pangu and was one of the outstanding members. The innate merit he received was among the top in Pangu's family. But Uncle was a progressive Saint.
He knew how to adapt to different versions, and he actively established the Human Sect.
Under such circumstances, the Cultivation Path Ancestor, Nuwa, and Saint Taiqing, who had established the Human Sect, all had sufficient reasons to introduce a version of Human Merit to gradually replace Heavenly Merit.
It is even very likely that the three of them reached a tacit agreement and created it together.