It is the Jews/Israel

666

the synagogue of Satan, as we were warned

their Moshiach = Christian Antichrist

https://www.google.com/search?client=firefox-b-d&q=Moshiach

Revelation 2:9

9 I know thy tribulation and thy poverty, but thou art rich: and thou art blasphemed by them that say they are Jews and are not, but are the synagogue of Satan.

Revelation 3:9

Behold, I will bring of the synagogue of Satan, who say they are Jews, and are not, but do lie. Behold, I will make them to come and adore before thy feet. And they shall know that I have loved thee.