What happens to the Gentiles after the Tribulation?
Gentiles who are prepared by God during the Tribulation will enter the coming Kingdom in ordinary flesh-and-blood bodies. They will help populate the thousand-year Kingdom, which will experience a tremendous population explosion, so that by the end of that thousand years there may be as many people on earth as now or more.
Les explains that although the Age of Grace was primarily to Gentiles, God has not forgotten Gentiles. Even during the Tribulation, He has still been preparing Gentiles to go into the Kingdom in ordinary flesh and blood bodies, because the Kingdom will see a tremendous population explosion. By the end of that thousand years, when Satan is released to test them once again, there will probably be as many people on the earth or more than there are right now. Isaiah chapter 24 then picks up these Gentiles and gives a graphic description of the Tribulation, where the earth is made empty, waste, and turned upside down, and all inhabitants are scattered under those cataclysmic seven-year judgments.