On "The Mystery of God"

In the seventh verse of Revelation chapter ten we read: "In the days of the voice of the seventh angel, when he shall begin to sound, the mystery of God shall be finished, as he has declared unto his servants the prophets."  What does Holy Scripture mean by this term, "the mystery of God"? The very purpose of God's choice, and, by His choice, His creation, of one nation alone, was to overthrow all fallen human ideas of Him.  For it is ultimately in the redemption of Israel that God reveals Himself to all Creation as He is.  It is in the atonement that God made for Israel through Yehoshua (Jesus) for the purpose of saving all Israel and returning his nation to his land that the God of Israel, the true Creator of heaven and earth, is overthrowing all idolatry of thought and expression. This redemption of Humanity is occurring in all times and places but there is one time and place in which the victory of God over all ideas of sinners about Him will be finished. It was finished as to the provision of an eternal atonement for the nation in the death and resurrection of Israel's Redeemer and it will be finished in the form of the salvation of all Israel in the land when the nation of Israel's eternal redemption is openly and undeniably declared before Jerusalem for the hope of all the world.