In Acts.. there were many Jews who had accepted Jesus as their Saviour. Early on in the New Testament.. a whole lot of the christians were Jews who recognised Jesus as the Messiah when He came.
Now, if someone now.. is Jewish AND into Judaism-- chances are they haven't received Jesus, since they are relying on keeping the Law, and are still waiting for a different Messiah than Jesus.
So Acts.. Jews who receive Christ... Galatians.. Jews who received Christ, following Jesus' faith in His churches who have Jews who are following the Law infecting them to try and go back to the Judaism way.
So.. a Jew will go to hell if they reject Jesus till the day they die. A Jew who received Christ.. no. They are going to heaven.
There is also a difference between Jewish people who are Jewish because of heritage and ethnicity.. and Jewish because they are into Judaism.