I am a postmillennialist! This means I believe the Kingdom of God will progress until the nations are very substantially Christianized. Yes, there will remain unsaved people. But the majority of the world’s population will be Christian (after all, this world is a wheat field, not a tare field ). I believe Paul was a postmillennialist too! His encouragement to the Corinthians, “Your labor is not in vain in the Lord” meant more than treasures stored up in heaven for faithful labors performed.