HaSatan (meaning "the adversary" in hebrew) is is the eternal enemy of the Jews, and the God of the gentiles. Let me prove it to you:
First, who exactly is Satan? Let's hear it directly from the Jewish messiah in Revelation 2:13, spoken to the church of Purgamum (ESV):
>I know where you dwell, where Satan’s throne is. Yet you hold fast my name, and you did not deny my faith even in the days of Antipas my faithful witness, who was killed among you, where Satan dwells.
He was referring to the Altar of Zeus in Purgamum (en.wikipedia.org
The gentiles worshipped Satan and pagan Gods, who are demons according to all abrahamic religions. Here are the Catholics stating so:
>In the same way the Greeks and Romans may have worshipped their divinities, fondly believing them to be good. But the Christian Scriptures declare that all the gods of the Gentiles are demons.
From the Catholic Encyclopedia: "Devil Worship"
newadvent.org
The Jewish messiah made the connection between Gentiles and Satan in Acts 26:17-18 (ESV):
>delivering you from your people and from the Gentiles—to whom I am sending you to open their eyes, so that they may turn from darkness to light and from the power of Satan to God...
However, he went on to claim that Jews were also the children of Satan by calling them "the synagogue of Satan" in Revelation 2:9 and 3:9, claiming they were only pretending to be Jews because of their killing of Christians, who are "the real Jews".
That statement makes absolutely zero sense, as Satan and His children despise Jews and wish nothing but their total destruction off the face of the earth. That was core doctrine for Jews up until Christianity and also after: that the gentiles worshipped Satan the enemy, and were His children.