The new Left Behind movie is a lie designed to make people complacent and feel like they will be able to come to the Lord when the true people of God "disappear" right before the eyes of the world.
It makes people believe there will be a second chance for them at that time. Even, to the extent that they can just wait for it to happen and then they'll give their lives to the Lord.
This is NOT going to happen. If you're left behind when the Lord returns, it's too late.
When He returns and gathers His people, He will then unleash His wrath on the world and many, many people will die at this time (immediately after the tribulation at the end of the final seven years). If you manage to survive, you might be given a second chance during the millennial reign of Christ, since the Word isn't perfectly clear on that, but do you really want to take that chance???
We even see indication that during the wrath of God, no one will be able to repent and be saved:
Revelation 15:8 The temple was filled with smoke from the glory of God and from His power, and no one was able to enter the temple till the seven plagues of the seven angels were completed.
There is a fictional book series called Left Behind that has become very popular recently and has even become a movie series. In this series, some of the people that are left behind realize that they missed the rapture and turn to God. They begin a crusade called the Tribulation Force to try and win over the other remaining people. While this is a great story, it is completely fictional and it will not happen. We know that the rapture will happen at the end of the final seven years and that it happens at the time of the Second Coming of Jesus Christ which is at the time of the Battle of Armageddon. Shortly after this, God sets up His kingdom on earth and removes all earthly governments. There will be no second chances. When God returns he is not coming for everyone, he will gather only His church to Him. The dead will rise first and those who are alive and remain will be changed in the twinkling of an eye from mortal to immortal and will be caught up to Jesus in the sky. None of those who remain will be part of the true church. God will then wipe out the armies coming down on Israel at Armageddon and will unleash His wrath upon the earth. Many, many people will die during this short period of time. Remember that this is the first resurrection and that the second resurrection, found in the end of Revelation 20 is the judgment of those who did not have the Holy Spirit, were not part of the true church, and did not follow Christ.
For a more detail explanation see this web page: The Rapture