Luke 3

Luke2:38 the son of Enosh, the son of Seth, the son of Adam, the son of God.

Actually I like the German translation more than the English translation. In the English version it says, that Adam was the son of God. But in the German version the translation is a bit different:

Luke2:38der war ein Sohn des Enos, der war ein Sohn Seths, der war ein Sohn Adams, der war Gottes.

That's the German translation, which says that Adam was God's ("der war Gottes"). He was from God. He belonged to God. He was God's.

And because Adam was God's, all the people listed up in the genealogy of Jesus are God's (including himself- but actually this genealogy is Joseph's, and Jesus is not the son of Joseph but the son of God...). That's also a reason, why all human beings are God's! But "all have sinned and fall short of the glory of God, being justified freely by His grace through the redemption that is in Christ Jesus"(Romans3:23+24). After the fall of men, men were not God's anymore. But they were born into the world, which was ruled by sin. So we know, that we can only be justified by the grace of God- by Jesus' death.