Compare the Ezekiel passages with Isaiah and Micah (not apocalyptic):
And it must occur in the final part of the days [that] the mountain of the house of Jehovah will become firmly established above the top of the mountains, and it will certainly be lifted up above the hills; and to it all the nations must stream. (Isa. 2:2)
And it must occur in the final part of the days [that] the mountain of the house of Jehovah will become firmly established above the top of the mountains, and it will certainly be lifted up above the hills; and to it peoples must stream. (Mic. 4:1)
After many days you will be given attention. In the final part of the years you will come to the land [of people] brought back from the sword, collected together out of many peoples, onto the mountains of Israel, that have proved to be a constantly devastated place; even [a land] that has been brought forth from the peoples, [where] they have dwelt in security, all of them. (Ezek. 38:8)
And you will be bound to come up against my people Israel, like clouds to cover the land. In the final part of the days it will occur, and I shall certainly bring you against my land, for the purpose that the nations may know me when I sanctify myself in you before their eyes, O Gog. This is what the Sovereign Lord Jehovah has said, Are you the same one of whom I spoke in the former days by the hand of my servants the prophets of Israel, who were prophesying in those days—years—as to bringing you in upon them? [Cursive script added.] (38:16, 17)
And I guess the writer of the book places the above in the realm of prophecy. It's quite straightforward. I'll go along with that. Let's not play with semantics and confuse the issue.
Question is: To whom is Ezekiel referring, to the mountains of "fleshly Israel" (1 Cor. 10:18a) or to the mountains of the Israel of God (Gal. 6:15, 16)?