My wife, after three episodes determined the basis for the entire LOST series is, in fact, Purgatory.
The title alone lends itself to the concept of purgatory, a paradise , “tropical island” , where you need to confront your past sins and during the process reconcile yourself through trial and tribulation to God.
Well we just had the final episode of LOST here in New Zealand and we are still left with a lot of answers. They said there would be answers in the final episode but you are still left confused. Only answer I got was why the plane crashed but nothing else seemed to make sense and others I have spoken to about it came to the same conclusion.