"The verb may mean to remove spatially. There is little reason then to deny that the noun can mean such a spatial removal or departure. Since the noun is used only one other time in the New Testament, of the apostasy from Moses [Acts 21:21], we can hardly conclude that its Biblical meaning is necessarily determined. The verb is used fifteen times in the New Testament. Of these fifteen, only three have to do with a departure from the faith [Lk.8:13; 1 Tim.4:1; Heb.3:12]. The word is used for departing from iniquity [2 Tim.2:19], from ungodly men [1 Tim.6:5], from the temple [Lk.2:27], from the body [2 Cor.12:8], and from persons [Acts 12:10; Lk.4:13]." "It is with full assurance of proper exegetical study and with complete confidence in the original languages, that the word meaning of 'apostasia' is defined as 'departure.'" Concludes Daniel Davey.So the word Rapture comes from the Latin "rapere" which comes from the Greek "apostasia", and all mean "departure".
"Let no one in any way deceive you, for it will not come unless the 'departure' comes first, and the man of lawlessness is revealed, the son of perdition." Vs 3.With that having been stated, the following passages of Scripture are in perfect harmony with the original text in vs 3, using the proper term, 'departure,' instead of 'falling away' or 'apostasy:'
"For the mystery of iniquity does already work; only he who now restrains will continue to restrain until he is taken out of the way." Vs 7. "And then shall that wicked one be revealed, whom the Lord shall consume with the spirit of His mouth, and shall destroy with the brilliance of His coming." Vs 8.From the above, we have a much clearer view of the above text referring to the rapture of the Church, when the antichrist will be revealed and when the tribulation will begin. Therefore, the Church will be raptured, then the antichrist will be revealed and the 70th 'Week' of Daniel, the 7 years of tribulation will begin, in Dan.9:27, that blends in perfect harmony with 2 Thes.2:3-8.