And everyone quit calling what I believe "adoptionism". The resurrected Jesus was begotten of the Father. You cannot adopt a son that you fathered. (Although I am not up on California law).
And I know that I am now inviting the question: "Then what did Paul mean by the term 'adoption'?" So let me beat you to it.
but you have received a spirit of [adoption as sons] by which we cry out, "Abba! Father!" (Rom 8:15 NAU)
even we ourselves groan within ourselves, waiting eagerly for our [adoption as sons], the redemption of our body. (Rom 8:23 NAU)
who are Israelites, to whom belongs the [adoption as sons], (Rom 9:4 NAU)
so that He might redeem those who were under the Law, that we might receive the [adoption as sons]. (Gal 4:5 NAU)
He predestined us to [adoption as sons] through Jesus Christ to Himself, (Eph 1:5 NAU)
"adoption as sons" is only one Greek word: 'huiothesia', and this is an exhaustive list of its usage in the NT.
Don't know why translators use the phrase 'adoption as sons' for this word. In no instance does the context infer anything other than "sonship"