What two classes of people will enter the Millennial Kingdom?

Les explains that the two classes going into the Kingdom are the remnant of Israel and surviving Gentiles. The remnant of Israel will be the largest single segment nationally, which is why Israel will be the greatest nation in the Kingdom Age. From the surviving Gentiles, a small number from each Gentile nation will enter. Les feels, though he cannot prove it from Scripture, that each of those Gentiles will go back to their homeland and be the seed stock, as believers, for the new generation during the thousand-year reign of Christ. He adds that Satan is locked up, there is no sin, and Christ will be the absolute ruler—a benevolent dictatorship—making it a glorious time. Because there is no sin, sickness, or death to speak of, there will likely be a population explosion, possibly rivaling the population explosion between Adam and the flood. The curse is lifted, including the pain and travail associated with childbirth.