not exactly. barabbas does not mean “son of God”, it means “son of the father”.
Bar = son, Abba = father.
Bar-abba = son of the father.
This is a play on Jesus, and John (and the other Evangelists) are making a point here.
At this point in salvation history, there is only one Son of the Father, our Lord. Through his death and resurrection, we are ransomed into His house (as the Exultet puts it: “To ransom a slave, you gave away a Son”).
If Jesus is the only true Son of the Father, who is the one called “Bar-Abba”? Who is his father?
Bar-Abba is called an insurrectionist and a murderer. He is the son of the Original Insurrectionist, and “a murderer from the beginning” - the prince of lies, Satan.
We are offered a choice - a most direct choice. Who is it we choose to release? to live with? Who do we release as our “Passover custom”?
IMO Mel Gibson does a tremendous job making this point in the Passion.
The true Son of the Father, or this faux Bar-abba?