…Our Father which art in heaven… – Matthew 6:9

Here is sonship-“Our Father which art in heaven.” How are we to understand this, and in what sense are we the sons and daughters of God? Some say that the Fatherhood of God is universal, and that every man, from the fact of his being created by God, is necessarily God’s son, and that therefore every man has a right to approach the throne of God, and say, “Our Father which art in heaven.” …I have never been able to see that creation necessarily implies fatherhood. I believe God has made many things that are not His children… He made the angels, who stand in an eminently high and holy position, are they His children? “Unto which of the angels said He at any time, thou art My son?” I do not find, as a rule, that angels are called the children of God; and I must demur to the idea that mere creation brings God necessarily into the relationship of a Father… Those who can say, “Our Father which art in heaven,” are something more than God’s creatures: they have been adopted into His family. He has taken them out of the old black family in which they were born; He has washed them. and cleansed them, and given them a new name and a new spirit, and made them “heirs of God, and joint-heirs with Christ;” and all this of His own free, sovereign, unmerited, distinguishing grace. And having adopted them to be His children, He has in the next place, regenerated them by the Spirit of the living God. He has “begotten them again unto a lively hope, by the resurrection of Jesus Christ from the dead,” and no man hath a right to claim God as his Father, unless he feeleth in his soul, and believeth, solemnly, through the faith of God’s election, that he has been adopted into the one family of which is in heaven and earth, and that he has been regenerated or born again. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/0213.cfm