Question for anyone who has seen the movie(s) or read the books:
I understand they dramatize the "Pre-Trib" view. I'm curious about the exact form they present. Do they teach that all Xians get Raptured? Or do only those who meet some standard of "righteousness" or "holiness" or doctrinal purity get taken up?
No, the "Left Behind" series does not teach a partial rapture. It teaches the rapture of every person who has truly believed in the Lord Jesus Christ.
But the form of the doctrine they present needs to be discussed. They strictly follow the system of interpretation introduced in the twentieth century by Dwight Pentecost.
The pre-tribulationists of the nineteenth century saw a significantly different scenario. They saw "the Beast," the Roman ruler, as only becoming official leader of the revived Roman Empire, and saw "the Antichrist" as being the end time ruler of Judah, which is now called Israel. They saw the Russian attack as coming after the Lord comes, not before Daniel's seventieth week. They pointed out numerous "time stamps" in Ezekiel 38 and 39 that make this very clear. And they spoke at length about the many scriptures that describe the end time individual called "the Assyrian." These make it very clear that the great attacker that comes down on Judah at the middle of Daniel's seventieth week is the individual the scriptures call "the Assyrian."
Dwight Pentecost saw the scriptures about "the Beast" having control of all the world, and all the world worshiping "the Beast," and so concluded that "the Beast," whom he called "the Antichrist," would become the official leader of the entire world. (His error here was in failing to realize that the Greek language has two words for "all." The general one, "pas," means all in a general sense, much as in our expression "all over the place." This is the Greek word used concerning the rule and worship of "the Beast." But the absolute all, "hapas," meaning "absolutely all," is not used of "the Beast."
This error led brother Pentecost to assume, quite incorrectly, that the attack by Gog, the end time ruler of Russia, would take place before the time of "the Beast." Likewise, he simply assumed, without a single scripture to back it up, that the great attacker that comes down at the midddle of the week would be "the Beast." And this scenario simply left no room for "the Assyrian," so brother Pentecost completely ignored that individual, despite the fact that more scriptures speak of him than speak of any other two end time humans. He is found in Isaian 7, 10, 14, 30, and 31, in Micah 5, and is the entire subject of the book of Nahum. (He is also "the king of the north" and the male goat's "little horn" from the book of Daniel, but that is another subject.)