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...