The Jews believed that Satan or Ha-Satan is a title as well, that not in dispute. And I don't dispute that too. To them it is a title (Satan) that is given to more than one angel.
But you don't get that the Lucifer is nothing more than a borrowing of name from Roman mythology.
When I read Isaiah 14:12, I don't see the morning star as a name or title, but metaphor or more precisely, a motif, and in this case the king of Babylon, and not angel of any sort, fallen or otherwise.
When I read 2 Peter 1:19 or Revelation 22:16, I see the motif again, but this time for Jesus. It is not a title for Jesus.
You do understand the difference between metaphor/motif and title, don't you?
Here is a simple example of motif:
It doesn't mean eyes are fire.
With the morning star metaphor, usually all the stars will fade with dawn, and the morning star is often the last object to fade with dawn, because it is larger from our perspective on ground level. A metaphor for the rise and fall of a king.
You said that the Morning Star have to do with Lucifer/Satan/Devil in the OT and Jesus in the NT, and not about a unnamed King of Babylonia. But I beg to differ, on one key point. What angel lay low "nations"?
It only make sense if you see the metaphor referring to the King of Babylonia, who lay low other kingdoms, in empire building. We know that the empires of Babylon have risen several time in ancient history, and we know that each time it has fallen. Four times Babylon have gained prominence:
- Old Babylonian period - Amorite dynasty (the most important king was (Hammurabi),
- Middle Babylonian period - Kassite dynasty,
- Middle Babylonian period - Pashe or Isin dynasty (Nebuchadrezzar I),
- and the Late Babylonian (or Neo-Babylonian) period - Chaldean dynasty (Nebuchadrezzar II).
During the time of Isaiah, the Assyrian emperors ruled Babylonia, Babylon was still considered an important city, like a 2nd capital for the Assyrian empire, next to Nineveh, so in essence, Babylonia still existed.
But what empire has Lucifer build?
It doesn't make sense to read verse 12 in Isaiah 14 without giving due consideration to verse 3 to 27. Do you ignore these 2 verses? (see below)
Do you see the angel Lucifer here?
It is bad form of scholarship I see from you. You are cherry-picking passages without giving due consideration to the context of the whole chapter.
But of course, you are going to ignore what I have written. It is the sort of haphazard propaganda I can expect from a Christian.