Is everyone a child of God?

Many people like to say that all humans are children of God.  Although God creates everyone and ultimately God is the Creator of all things, it is incorrect to say that every human being is a child of God.  How do we know this?  Jesus of Nazareth taught us that not everyone is a child of God.  If you are shaking your head, right now, it is because you have been influenced by secular, humanistic love concept that emphasizes that God loves all and God is the father of all. That is more a pagan idea, than a Christian idea. Bible shows what the Christian concept is.  We know that not everyone is a child of God, because God calls some people children of the Devil. You cannot be both a child of God and a child of Satan, can you?  In John 8:44, Jesus Christ says to the Jews who do not accept Him as God:  “You are of your father the devil, and you want to do the desires of your father.”  We see from this claim of Jesus Christ that not everyone is a child of God.  Only those who accept Jesus Christ as Savior and God are the children of God.