If only they could get Gog and Magog correct! Notice it says mountains of Israel in Ezekiel 39:2.

In the New Testament it says Gog and Magog will come out and cover the broad plain of the earth, the camp of the saints, the beloved city (and then it says but fire comes down and destroys the enemies of God).

Revelation 20:8-10

and will come out to deceive the nations which are at the four corners of the earth, Gog and Magog, to gather them together for the war; the number of them is like the sand of the seashore. And they came up on the broad plain of the earth and surrounded the camp of the saints and the beloved city, but fire comes down from heaven and destroys the enemies of God. And the devil who deceived them was thrown into the lake of fire and brimstone, where the beast and the false prophet are also; and they will be tormented day and night forever and ever.

We learn in the book of Hebrews we have come to mount Zion, the city of the living God (Hebrews 12:22).

We are called spiritual Israel. All who come through the narrow gate. God will circumcise their hearts—he writes the law on their hearts and remembers their sin no more.

The Old Testament saints were saved the same way!

How blessed is a person whose guilt the Lord does not take into account, And in whose spirit there is no deceit!
Psalm 32:2