If you made the mistake of seeing the movie before reading the book, please don't give up on the series. I bought my first copy of any of the books in May of this year, and already I'm almost finished with book 10. I dare say the movie is a piece of trash that doesn't do the series even a sniff of justice. While "Left Behind: the movie" only vaguely follows the story of the "Left Behind" (the book), the characters aren't even close to accurate.
A few examples: Rayford never acts on his feelings for Hattie (he is about to when he's informed of the vanishings); Buck Williams is a blonde haired, magazine writer, not a TV reporter; Chloe is at Stanford, and a lot of the book details Rayford wondering if she 'survived'; Buck and Chloe don't meet until much later, at a meeting in New York, set up by Hattie; Irene and Raymie are never 'in the book,' rather just in Rayford's flashback thoughts; the roads are so jam packed with wrecks following the rapture that Rayford and Hattie have to helicopter back to the suburbs... etc, etc, etc...
And that's just from the first movie; they're about to release the third. Please, even if you didn't like the movies, give the book series a chance.