There are various elect, angels, the OT righteous, NT pre-Pentecost believers, the church, tribulation saints, and those who become believers and live through and after the tribulation.
These last are the ones who have offspring who are not believers (not elect), and their offspring, ect. for the thousand years that come to comprise Satan’s army for the Rev. 20:8 revolt.
Then the GWT judgment.
to clarify, not all the offspring are unbelievers (not elect)