Take a look at Ephesians 1:5-7 in the Mirror Word Bible
5) He is the architect of our design; his heart dream realized our coming of age in Christ. (Adoption here is not what it means in our Western society, it is a coming of age, like the typical Jewish Barmitsva. See Galatians 4:1-6, “ … and to seal our sonship the spirit of his son echoes Abba Father in our hearts.” This is huiothesia.)
6) His grace-plan is to be celebrated: he greatly endeared us and highly favored us in Christ. His love for his Son is his love for us.
7) Since we are (fully represented) in him, his blood is the ransom that secures our redemption. His forgiving us our sins measures the wealth of his grace.
Don’t think adoption, we were His from before the earth was made. We were made from his very DNA. He is our template. He is not example for us but of us.
It’s coming of age realizing who and whose we were all along.
Adoption still carries a stigma of not a blood relative. We are all blood relatives. He is our dad.
The Gospel is not something for us to accept but the in fact the Gospel is that he has accepted us before the earth was formed.