When Christy returns in power and great glory He will immediately judge those wicked people who joined with Antichrist in his rebellion against God. However, there will be unconverted people left upon the earth who will not at that time be judged for not all will have joined in Antichrist's rebellion. Consider what we read in Zech 14:16. "And it shall come to pass, that every one that is left of all the nations which came against Jerusalem shall even go up from year to year to worship the King, the LORD of hosts, and to keep the feast of tabernacles." That is a vital verse when it comes to understanding what will take place during the 1000 year reign of Christ upon the earth.