The answer from God’s word:
“The work of managing mankind is divided into three stages, which means that the work of saving mankind is divided into three stages. These three stages do not include the work of creating the world, but are rather the three stages of the work of the Age of Law, the Age of Grace, and the Age of Kingdom. The work of creating the world was the work of producing the whole of mankind. It was not the work of saving mankind, and bears no relation to the work of saving mankind, for when the world was created mankind had not been corrupted by Satan, and so there was no need to carry out the work of mankind’s salvation. The work of saving mankind only began once mankind had been corrupted, and so the work of managing mankind also only began once mankind had been corrupted.”
from “Knowing the Three Stages of God’s Work Is the Path to Knowing God” in The Word Appears in the Flesh