How to figure out Lost

How to figure out Lost:
What was the end of Lost about? Do they call the show Lost because it is impossible to figure out and the viewer is lost?
I think the Jack was dead the whole time. So why did they have all the sideways flashes and go back in time? Was the Island like Purgatory? When I first started watching the show that is what I thought, but the directors said it was not. Now it appears it was. All the people had to come together and build a church to fix their lives and move on. Is that what the show was about? Every time I think I have the show figured out then I remember something about the show that does not make sense. There are so many questions unanswered. Did they just make a show for six seasons about that was really about a guy dying in 3 minutes? I need to get a job in Hollywood.
Some of the answers on the internet indicate that people don’t really know what Lost was about:
http://answers.yahoo.com/question/index?qid=20100523205632AACKBr4
While other write a thesis on the subject:
http://en.wikipedia.org/wiki/What_Was_Lost
You can even watch all the episodes online at ABC:
http://abc.go.com/shows/lost
The website also has area to discuss the end. I guess it depends on your beliefs. It can mean different things to different people. It was a way for people to come together and build something or fix their lives and move on.