2 Thessalonians 2:3 Let no man deceive you by any means: for that day shall not come, except there come a falling away first, and that man of sin be revealed, the son of perdition; The falling away is translated from the word apostasia, [from the greek manuscripts of the new testament,] from which we get the word apostacy. It is refering to falling away from the faith. American heritage dictionary. definition apostacy--an abandonement of one's religious faith, political party or cause. It has absolutely nothing to do with the rapture or any kind of leaving of the Holy Spirit. That is simply false teaching by false prophets. The antichrist will not want Christians preparing for persecution, so false prophecy is arising in the churches pushing the pre trib rapture idea. The Christians falsely thinking they will simply leave before the trouble starts, will leave them unprepared for the future persecution of the antichrist against them. Scriptures showing antichrist will be killing Christians during his reign. Daniel 12:7 And I heard the man clothed in linen, which was upon the waters of the river, when he held up his right hand and his left hand unto heaven, and sware by him that liveth for ever that it shall be for a time, times, and an half; and when he shall have accomplished to scatter the power of the holy people, all these things shall be finished. Revelation 6:9 And when he had opened the fifth seal, I saw under the altar the souls of them that were slain for the word of God, and for the testimony which they held: Revelation 6:10 And they cried with a loud voice, saying, How long, O Lord, holy and true, dost thou not judge and avenge our blood on them that dwell on the earth? Revelation 6:11 And white robes were given unto every one of them; and it was said unto them, that they should rest yet for a little season, until their fellowservants also and their brethren, that should be killed as they [were], should be fulfilled. Some of the false prophets try to get around the definition of apostasia by saying it means depart and then they try to say that it is referring to the rapture. It makes no difference if it means depart. Paul used the word depart to refer to falling away from the faith in the latter time. Apostasia means depart; depart from the faith. 1 Timothy 4:1 Now the Spirit speaketh expressly, that in the latter times some shall depart from the faith, giving heed to seducing spirits, and doctrines of devils; The false prophets, which have the big expensive ministries, and big voices in the Christian world, want people to believe in the pre trib rapture. The antichrist will not want Christians to prepare for the coming persecutions that the antichrist and his followers have prepared for them. That the rapture of the church is post tribulation is evident from Matt. 24; a clear teaching of the bible. Matthew 24:29 Immediately after the tribulation of those days shall the sun be darkened, and the moon shall not give her light, and the stars shall fall from heaven, and the powers of the heavens shall be shaken: Matthew 24:30 And then shall appear the sign of the Son of man in heaven: and then shall all the tribes of the earth mourn, and they shall see the Son of man coming in the clouds of heaven with power and great glory. Matthew 24:31 And he shall send his angels with a great sound of a trumpet, and they shall gather together his elect from the four winds, from one end of heaven to the other.