It sounds as if you have read the bible. It does predict events leading up to the time when millions will go missing from the earth. There will be wars and rumors of wars, famine, earthquacks in diverse places, mankind will become ravenous toward each other, the relationship between parents and children will be at odds (love will wax cold), there are lots more things the bible says about the latter days.

As for what Jesus will do, He will take those who believe that He came, died and rose again from this earth back to heaven with Him for 7 years.

Being a Christian on here will bring the wrath of many, but such is life. I am not ashamed of my Lord and my faith.