These are rhetorical questions, so I hope they don't get edited out. Isn't the subject of Daniel God's dealing with Israel, their destiny as a nation?

Seventy weeks are apportioned for your people and for your holy city, to close the transgression, and to make an end of sins...Dan 9:24.

Of course there are lessons on loving God, overcoming idols, the veil against the true God which lies on humanity naturally. The first six chapters cover the kind of persons Daniel and his companions were. We see God's control and plan in making them officials in their capturing country. (How they obeyed God, seeking the peace of Babylon).

Babylon's nature is explored in its very emperors, Nebuchadnezzar and his grandson(? nonrhetorical). God even deals personally with Nebuchadnezzar, maybe successfully to save him (? nonrh.) And there's the opening basic vision of four world empires followed by Messiah's (second) coming to destroy them and take over. Daniel experienced "all" the first empire and the start of the second.

I say nation of Israel because though Christ, God's Messiah, is revealed to Daniel, and even one of the most striking prophecies of His death and the time of it, Israel as a nation still won't receive Him until the very end of this age (9:24-27). This is "seconded" in the Lord Jesus in Matthew 21 & 24 and in Romans 11 by Paul, quoting Isaiah (who also prophesied Jehovah's using of Babylon to discipline His people).

For I do not want you, brothers, to be ignorant of this mystery (lest you be wise in yourselves), that hardness has come upon Israel in part, until the fullness of the Gentiles comes in; and thus all Israel will be saved, as it is written, "The Deliverer will come out of Zion; He will turn away ungodliness from Jacob. And this is the covenant from Me with them, when I take away their sins." According to the gospel they are enemies for your sake, but according to the selection they are beloved for the fathers' sake. For the gracious gifts and the calling of God are irrevocable. For just as you once disobeyed God, but now have been shown mercy because of their disobedience, so these also now have disobeyed, so that because of the mercy shown to you they also now may be shown mercy. For God has shut up all in disobedience that He might show mercy to all. O the depth of the riches and wisdom and knowledge of God! How unsearchable are His judgments and untraceable His ways! For who has known the mind of the Lord, or who has become His counselor? Or who has first given to Him, and it will be repaid to him? Because out from Him and through Him and to Him are all things. To Him be the glory forever. Amen.

[Irrevocable. Which also, btw, puts the lie to the evil Pelagianistic teaching that New Testament Christians can lose their salvation eternally, or lose their eternal salvation.]

Therefore I say to you that the kingdom of God shall be taken from you and shall be given to a nation producing its fruit......But learn the parable from the fig tree: As soon as its branch has become tender and puts forth its leaves, you know that the summer is near.

Although nominally Christian Catholicism and Orthodoxy, and pagans like Hitler, physically persecuted both genuine Christians and also Jews (and others), the nation of Israel in their promised land has a history of huge dealing by (Asssyria and) Babylon and Persia (positive in a way) and Greece and ultimately Rome, up through 70 AD and eventually for 7 more years, in particular 3 1/2. Dan 9:26 reveals a deliberate gap in Israel's prophecy between the end of their "69th" week of years and Israel's final seven years to come.

God's gift of His Son, grace, is free to anyone who believes, Jewish or Gentile. But God did have a particular economy to spread to the Gentiles (through Paul to start), and God will save spiritually the remnant physical nation of Israel when they physically see Him whom they pierced when He physically returns to also physically deliver them from Antichrist. That's why Daniel 11 is a detail on Greece. And also message to the whole world, or anyone who can read, of the situation at the coming end. Antiochus Epiphanes in particular detailedly prefigures the Antichrist.