Seek Jesus
If you have recognized the fact that God has super-naturally snatched away His people, before anything else, do not delay in seeking Jesus and making Him the Lord of your heart. It's too late to be caught up in the clouds, but it is not too late to live forever, in perfect peace, with your Creator!
If you've been trusting in yourself and something you've done, it's time to repent and start placing your trust completely in Jesus and His perfect sacrifice, in your place, on the cross.
Then he said to Jesus, “Lord remember me when You come into Your kingdom.” Jesus said to him, “Assuredly, I say to you, today you will be with Me in Paradise.”
But Paul called with a loud voice, saying, “Do yourself no harm, for we are all here. Then he called for a light, ran in, and fell down trembling before Paul and Silas. And he brought them out and said, “Sirs, what must I do to be saved?” So they said, “Believe on the Lord Jesus Christ, and you will be saved, you and your household.”
that if you confess with your mouth the Lord Jesus and believe in your heart that God has raised Him from the dead, you will be saved. For with the heart one believes unto righteousness, and with the mouth confession is made unto salvation. For the Scripture says, “Whoever believes on Him will not be put to shame.” For there is no distinction between Jew and Greek, for the same Lord over all is rich to all who call upon Him. For “whoever calls on the name of the LORD shall be saved.”
For by grace you have been saved through faith, and that not of yourselves; it is the gift of God, not of works, lest anyone should boast.
What really happened to those who disappeared?
No, it wasn't aliens!
Then we who are alive and remain shall be caught up together with them in the clouds to meet the Lord in the air. And thus we shall always be with the Lord.
If there appear to be non-human beings around claiming to be aliens or anything else, they are simply demonic spirits who fell with satan. The Bible warns about satan and his ministers being able to falsely appear to us like angels of light.
For such are false apostles, deceitful workers, transforming themselves into apostles of Christ. And no wonder! For Satan himself transforms himself into an angel of light. Therefore it is no great thing if his ministers also transform themselves into ministers of righteousness, whose end will be according to their works.
A time of great deception
Recognize that during the time between the catching-away of those who know Jesus and His Second Coming to earth, great deception, beyond anything in history, will begin to spread. We're not given specific details other than a warning that it could deceive even the elect, those who have placed their trust in Jesus.
For then there will be great tribulation, such as has not been since the beginning of the world until this time, no, nor ever shall be. And unless those days were shortened, no flesh would be saved; but for the elect’s sake those days will be shortened.
Then if anyone says to you, ‘Look, here is the Christ!’ or ‘There!’ do not believe it. For false christs and false prophets will rise and show great signs and wonders to deceive, if possible, even the elect. See, I have told you beforehand.
Therefore if they say to you, ‘Look, He is in the desert!’ do not go out; or ‘Look, He is in the inner rooms!’ do not believe it. For as the lightning comes from the east and flashes to the west, so also will the coming of the Son of Man be.
For in those days there will be tribulation, such as has not been since the beginning of the creation which God created until this time, nor ever shall be. And unless the Lord had shortened those days, no flesh would be saved; but for the elect’s sake, whom He chose, He shortened the days.
Then if anyone says to you, ‘Look, here is the Christ!’ or, ‘Look, He is there!’ do not believe it. For false christs and false prophets will rise and show signs and wonders to deceive, if possible, even the elect. But take heed; see, I have told you all things beforehand.
But in those days, after that tribulation, the sun will be darkened, and the moon will not give its light; the stars of heaven will fall, and the powers in the heavens will be shaken. Then they will see the Son of Man coming in the clouds with great power and glory. And then He will send His angels, and gather together His elect from the four winds, from the farthest part of earth to the farthest part of heaven.