Revelation 20:7-9 indicates that there will be a multitude who are deceived by Satan at the end of the Millenium. These are likely the offspring of those who enter the Kingdom as believers in natural bodies from the Tribulation, who rebel against the righteous rule of Jesus Christ during that time. Sin will be present in the Kingdom, though righteousness and justice will prevail.
Do you think our generation will be the one in the rapture?
Throughout history, each generation has believed it could be the generation alive when Jesus returns for His Church. In fact, Paul seemed to think his generation could be the one in the rapture (1 Thessalonians 4:17). Certainly, nothing needs to take place prior to the Rapture in order for it to happen in our lifetime. Jesus could return during our generation, or many more generations in the future. The fact that Jesus return is imminent should cause us to live with a sense of urgency and focus as we attempt to bring Him glory during our time on the earth.