God sent his son to make us sons

"But when the fullness of time had come, God sent forth his son, born of a woman, born under the law, to redeem those who were under the law, so that we might receive adoption as sons" Galatians 4:4

God sent forth his son. . .

1. to redeem those under the law
2. that we might receive adoption

Note that the word for adoption has the same root as the greek word for son. This leads me to think that one of the primary emphases Paul is making here is that Jesus was sent by the father fundamentally to bring us home to the father.