The deception is called the “Pre-Tribulation rapture” In which it’s claimed Jesus returns secretly and takes certain people to heaven leaving the rest of the population to suffer “7 years of tribulation” Thus, the ones taken to heaven will not have to suffer the Great Time of Trouble.
This is a pure Satanic lie, the purpose is to lull those who believe this lie to relax and not worry about the coming Great Time of Trouble so when it does come, these will be totally unprepared to withstand and will more than likely receive the mark of the beast.
Most importantly, the people who believe this lie totally forget, the coming Great Time of Trouble is God’s test to see who is loyal to the end. Certainly, no one goes to heaven without this test.