There are many people, primarily Christians, who had hopes and dreams of being in the millennial kingdom of God, and who have discovered that the things they said and did will keep them out of the millennial kingdom for all eternity. They may have lived righteously, but committed blasphemy. They may have gossiped about or profoundly slandered the Holy Spirit Of God.
They may have had one too many sexual encounters. They may have had a love affair with a married man for whom they bore no children. They may have defiled the cross of Christ. They may have committed at least one act of debauchery that caused them to have a spirit of greed. Whatever the reason, they no longer are eligible to be in the millennial kingdom of God.
God does not hold people accountable for sins they committed unknowingly. However, when someone knows exactly what they are doing, and is acting strategically to achieve a designed purpose, they must be held accountable.
The Lord God Almighty El Shaddai