The millennium was very popular in some areas, not so much in others. It boiled down often to the culture of the area. Those who were influenced by Greek thought and philosphy viewed it close to the amil position, those who were more influenced by eastern thought the premil.
If you have an e reader, you can down load the whole set of writings of the ECF for cheap. I would also encourage you to read Augustine, not just the parts that we all like to pick out. Or you can read Pelekin’s works on the history of theology for the thumbnail version. The latter has a nice write up of the influence of the millennium theology and why the lines ended up where they are.
For the record, I am a LCMS Lutheran and not premil.
Going on the “Bible Alone” heresy, show in Scripture,
Jesus Christ is returning in the new time, the 7th Day
in His person to reign.
It’s not true. God’s reign will be spiritual.