"Synagogue of Satan" as those "which say they are Jews, and are not..." Who is / isn't a Jew? Romans 2:28-29, "For he is not a Jew, which is one outwardly; neither is that circumcision, which is outward in the flesh: But he is a Jew, which is one inwardly; and circumcision is that of the heart..." On circumcision, Philippians 3:3, "For we are the circumcision, which worship God in the spirit, and rejoice in Christ Jesus..." On Satan, 1 John 2:22, "Who is a liar but he that denieth that Jesus is the Christ? He is antichrist, that denieth the Father and the Son." To deny Jesus is the Christ, you have to believe there IS a Christ but it's not Jesus, which is a tenet of Judaism. Finally, "synagogue" points to religion not race.