“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; who opposeth and exalteth himself above all that is called God, or that is worshipped; so that he as God sitteth in the temple of God, shewing himself that he is God.” 2 Thessalonians 2:3-4 (KJV)
This letter was written partly to warn them against the deceivers. Deceivers have a way of robbing people of their hope, joy and peace; replacing true peace with the false. Do not let anyone deceive you.
The “Day of the Lord” is not the “Rapture of the Church”. “The day of the Lord” will not begin until after the rapture, or the “Catching away of the Church”; the “falling way” apostasy (which could occur before the rapture) due to persecution; and the revealing of the “Man of sin” (or Anti-christ) which will follow the rapture.
The apostasy is a rebellion against all that is godly. It will even involve professing Christians who do not know Jesus. They are Christians only because their parents were, or they were “Born in a Christian home”; not due to the new birth in Christ Jesus. These will see Jesus as any other religious leader. This christianity to them is only a religion of choice just as the others. Being a Christian is in fact a personal relationship into which one is called – chosen by God; the Living God, and it is the only way to eternal life in Heaven.
The apostasy is in affect a militant uprising against all that is pure and for all things that are against God, Jesus and His Church. There is even today, an attempt to silence the Church and the Word of God; especially in the public forum; private owner businesses, and in political debate.
There is also, “the man of sin”, also called the “Son of perdition” who will be revealed, probably, very near to either side of the rapture. Jesus mentions “The son of perdition” in John 17:12. He was in the person of Judas Iscariot the betrayer. This man who will come on the scene will exalt himself, call himself “God”, and will sit in the temple of God – this in the city of Jerusalem. This man will be revealed as the Evil one when he breaks his covenant with Israel three and one half years into the tribulation period. His first introduction will be as a man of peace, and seeming ability to end world economic, religious, and environmental problems (See Revelation 6:1-2). He will be a world ruler.
There is only one World Ruler we can trust and His name is Jesus. He died on the cross for our sins, was buried and bodily arose, and is returning to put an end to sin; and He will reign forever more.