what does the bible say?
The rapture is described as a future event in which believers are caught up to meet the Lord, joining with the Christians who died before the rapture (1 Thessalonians 4:13–18; 1 Corinthians 15:51–53). The Bible calls for faith in Christ now, highlighting the urgency to be saved before that time, rather than assuming we get a second chance (2 Corinthians 6:2; Hebrews 3:7–8).
However, it is true that after the rapture, many will be saved during a period known as the tribulation. Supporting this, John described his vision of a vast, international multitude coming through that period (Revelation 7:9–14). He also recorded martyrs killed during that time and people who refused the mark of the beast (Revelation 6:9–11; 13:16–17; 20:4). These and other passages indicate that people will be saved after the rapture.
At the same time, Scripture warns of the strong deception during that period, indicating that most people will not be saved because they follow lies (2 Thessalonians 2:9–12; Matthew 24:24). Also, those who are saved will face greater persecution than any believer has endured before (Matthew 24:21), making it a challenging time for salvation. However, Scripture also assures that God will ensure that those who are saved during that period will endure until the end (Matthew 24:22).