Only those who've accepted Jesus christ as their personal Savior are children of God / born-again. Adam and Eve were created old enough to have children.
I would disagree, those are "true" children of God, as in true to follow the path we were meant to follow. But every person ever born are children of adam and eve, who were created by God, and because of that, they are still children of God, its just that they have left God's path like the prodigal son or children of the prodigal. God created the human race, so the human race are His children whether they want to be or not. Have you ever heard the phrase, "true children of God"? Thats what believers in Christ who follow the path He gave us are, as in true to follow the path to salvation laid out for us.
