Jeremiah 25: Does the king of Babylon serve the Lord?

 The chapters of Jeremiah are not organized in a chronological way. This chapter begins with:

1 The word that came to Jeremiah concerning all the people of Judah, in the fourth year of Jehoiakim the son of Josiah, king of Judah (that was the first year of Nebuchadnezzar king of Babylon),

Thus, as he reigned in 609–598 BC (https://en.wikipedia.org/wiki/Jehoiakim), it must have been written in 605 BC.

2 Jeremiah the prophet delivered the Message to all the people of Judah and citizens of Jerusalem:

3 From the thirteenth year of Josiah son of Amon king of Judah right up to the present day—twenty-three years it’s been!—God’s Word has come to me, and from early each morning to late every night I’ve passed it on to you. And you haven’t listened to a word of it!

4-6 Not only that but God also sent a steady stream of prophets to you who were just as persistent as me, and you never listened. They told you, “Turn back—right now, each one of you!—from your evil way of life and bad behavior, and live in the land God gave you and your ancestors, the land he intended to give you forever. Don’t follow the god-fads of the day, taking up and worshiping these no-gods. Don’t make me angry with your god-businesses, making and selling gods—a dangerous business!

Jeremiah began to preach 23 years before, that is -605-23 BC = -628 BC. He preached to people to repent. Even today, people follow the god-fads of the day and worshiping these no-gods (specially using social media, internet, etc.), but Jeremiah warned about the bad consequences of it.

7 “You refused to listen to any of this, and now I am really angry. These god-making businesses of yours are your doom.”

8-11 The verdict of God-of-the-Angel-Armies on all this: “Because you have refused to listen to what I’ve said, I’m stepping in. I’m sending for the armies out of the north headed by Nebuchadnezzar king of Babylon, my servant in this, and I’m setting them on this land and people and even the surrounding countries. I’m devoting the whole works to total destruction—a horror to top all the horrors in history. And I’ll banish every sound of joy—singing, laughter, marriage festivities, genial workmen, candlelit suppers. The whole landscape will be one vast wasteland. These countries will be in subjection to the king of Babylon for seventy years.

Nebuchadnezzar king of Babylon is called servant of the Lord, but does he really worship the Lord? No, even though he is evil, he will serve the Lord.

12-14 “Once the seventy years is up, I’ll punish the king of Babylon and the whole nation of Babylon for their sin. Then they’ll be the wasteland. Everything that I said I’d do to that country, I’ll do—everything that’s written in this book, everything Jeremiah preached against all the godless nations. Many nations and great kings will make slaves of the Babylonians, paying them back for everything they’ve done to others. They won’t get by with anything.” God’s Decree.

The king of Babylon will be punished by the Lord. The Lord is righteous and in his sovereignty, even the evil serves Him.