Rev 2:9 I know thy works, and tribulation, and poverty, (but thou art rich)
The above referring to the church at Smyrna...
and I know the blasphemy of them which say they are Jews, and are not, but are the synagogue of Satan.
It DOES NOT say 'those which are Jews'...It says 'those which say they are Jews'...
There are people who say they are Jews, and they are...
There are others who say they are Jews and they are not...Those others who claim to be 'Israel/Jews' and are not are the church of Satan...
Real Jews love Jesus.
The language used in Rev. 2 is really no different than the language Paul uses to describe "Israel".
"But it is not that the word of God has taken no effect. For they are not all Israel who are of Israel, nor are they all children because they are the seed of Abraham; but, 'In Isaac your seed shall be called.'" (Rom. 9:6,7)
Not evenyone who claims to be a Jews by virtue of the "brthright" from Abraham really is a Jew because they do not share in the faith of Abraham. If they did share in the faith of Abraham they would fall down before Jesus the Messiah and true King of Israel, the one seated on David's throne in heaven.
"For he is not a Jew who is one outwardly, nor is circumcision that which is outward in the flesh; but he is a Jew who is one inwardly; and circumcision is that of the heart, in the Spirit, not in the letter; whose praise is not from men but from God." (Rom. 2:28,29)
There are people who say they are Jews, and they are...
Real Jews follow Jesus.
True Israel will (eventually) come to faith in Christ.