Why did the beast god in Zhu Xian's novels destroy the world?

As mentioned above, he was created by a saint of the Sage Witch family, and later his power became stronger and more evil. The saint tried to destroy him for the safety of the whole family and even all mankind. He hated because of love, and even turned his hatred to the world, so he tried to destroy the world to get back at the virgin Mary. I guess so. You can read Zhu Xian. I remember that year, because I read this novel, I was interested in playing Dreaming of Immortals!