A strong delusion is mentioned in the New Testament: 2 Thessalonians 2:11 And for this reason God shall send them a strong delusion, that they should believe a lie.
This delusion has people looking forward to the 2nd Coming (in the so called rapture to heaven, Pre, Mid, or Post) believing in a rapture removal from the earth. The reality is, we experience His glorious salvation when we enter into the blessed assurance that Christ’s Death means the penalty for our sin has been paid because of His sacrifice on the Cross. Ever since then, believers must trust in Jesus for their salvation and for their protection during the testing times to come. Isaiah 43:2, Psalms 31:23-24
And if the Lord does not save them, just as has happened to the millions of martyrs in the last 2 centuries, then we must die trusting in His promise of resurrection. Revelation 12:11, Revelation 13:10 Our souls will be kept under the heavenly Altar, Revelation 6:9-11, and Jesus will bring them with Him at His Return, then bring us to life again, to reign with Him for 1000 years. Revelation 20:4
Jesus said: take care that you be not deceived..... Seems that many have been rather careless!