The law never belonged to the Gentiles. The law is not our ex-spouse. At the end of Romans 9, Paul reminds his readers that the Gentiles were not even pursuing righteousness, but they attained it. They had no relationship with the law. The Jews were the ones who were married to the law, and yet they didn't attain righteousness, because they tried to attain it by their marriage to the law, and not by faith. The Gentiles, who were not married to the law and weren't even trying to be righteous (they weren't pursuing righteousness), attained it anyway, because they bypassed the law completely and simply believed in Christ.
Apart from law, Gentiles believed and became righteous.
Apart from pursuing righteousness they became righteous. It wasn't until they had
already been established in a relationship with Jesus, by faith alone, apart
from any involvement from the law, that the Judaizers came along and introduced the law to them, trying to get them to add their Jewish law, which
the Gentiles had never known, to their lives in Christ. The Galatians were
being "bewitched," but they weren't being bewitched to go
"back" to the law. Again, they had previously not had a relationship
with the law and had not even been pursuing righteousness. Rather, they were
being bewitched into "adding" law where there had previously been no
law.
The "tutor" or "guardian" of the law was
purely for those who had been in that relationship with the law - those who had
actually been under the law and who had been pursuing righteousness by their
attempts at keeping the law - the Jews. The Gentiles had been under no such
guardianship. They had been on the outside of all of this, and had no law and
no covenants of promise with God, and were "far off," having "no
hope and without God in the world" (Eph 2:12). They weren't even trying to pursue
righteousness, but they found it anyway, because Jesus shed His blood for them
and brought them near that way. "But now in Christ Jesus you who once were
far off (Gentiles) have been brought near by the blood of Christ" (Eph 2:13).
The Gentiles hadn't been led to faith in Christ by the law,
which they had never known in the first place. They had been led to faith in
Christ through the message of the good news that Christ's blood had been shed
for them just as it had been shed for those who had the law and the covenants
of promise and the heritage of God. They had been led to Christ through the
message that while they were once considered as "dogs" on the
outside, God had shown His love for them equally and had provided the way for
them to be equal heirs with the Jews in His family.
Both those who had been married to the law and those who had
had no relationship to the law whatsoever were now joined together into
"one" body ("one new man" – Eph 2:15). The Jewish people
had to die to the law that they had been married to, in order to now be joined
to Christ. The Gentiles, who had been without law, had to simply accept the
invitation, by faith, to become part of this new family that God was forming
out of the two.

