'Period of Tribulation - 5th Seal'
Rev 12:7-9 And war broke out in heaven: Michael and his angels fought with the dragon; and the dragon and his angels fought, but they did not prevail, nor was a place found for them in heaven any longer. So the great dragon was cast out, that serpent of old, called the Devil and Satan, who deceives the whole world; he was cast to the earth, and his angels were cast out with him.
Before Rapture, Michael the Archangel will overcome Satan and his fallen angels and cast them down to earth to start the period of the wrath of Satan (Period of Sorrows/Tribulation) for 42 months in Rev 13:1-10 for the refining of Christians.
Rev 12:11 And they overcame him by the blood of the Lamb and by the word of their testimony, and they did not love their lives to the death.
All those caught up at Rapture have already overcome Satan in the wrath of Satan including the great Tribulation, and they will definitely be found worthy to be His bride.
What were the sins of Satan
Isa 14:12-14 "How you are fallen from heaven, O Lucifer, son of the morning! How you are cut down to the ground, you who weakened the nations! For you have said in your heart: 'I will ascend into heaven, I will exalt my throne above the stars of God; I will also sit on the mount of the Congregation on the farthest sides of the north; I will ascend above the heights of the clouds, I will be like the Most High.'
Satan (Lucifer then) wanted to exalt himself above all the other angels (stars). He wanted to sit on the mount before the congregation of all the heavenly hosts and be the Most High. So he rebelled against the Almighty God. Surprisingly, a third of these powerful and intelligent angels followed him in the rebellion.
2Thess 2:3-5 Let no one deceive you by any means; for that Day will not come unless the falling away comes first, and the man of sin is revealed, the son of perdition, who opposes and exalts himself above all that is called God or that is worshiped, so that he sits as God in the temple of God, showing himself that he is God. Do you not remember that when I was still with you I told you these things?
Since Satan was unsuccessful in his rebellion against the Almighty God in the heavenly realm, he sets his target on mankind and to deceive them to worship Him as god. God allows him to build the temple of God for God uses this period of the great Tribulation to prepare the bride of the Lamb, by refining His people through persecutions, sufferings, beatings, imprisonments, exclusions and also martyrdoms.
2Thess 2:8 And then the lawless one will be revealed, whom the Lord will consume with the breath of His mouth and destroy with the brightness of His coming.
God will avenge all His martyrs by killing the Antichrist at Rapture by the glorious coming of our Lord Jesus Christ. Then all mankind, especially those left behind, will release and know that the Antichrist was never god nor the messiah.
Rev 3:21 To him who overcomes I will grant to sit with Me on My throne, as I also overcame and sat down with My Father on His throne.
Brethren, we thank God that what Satan could not achieve by rebellion, God gladly shared His throne with us (the bride of the Lamb), who by abiding in Christ Jesus have overcome Satan.