I started out a pre-tribulationist in an AG church, but became a mid-tribulationist. At that point, our highly educated Sunday school teacher gave me a copy of his white paper on the subject to bring me back. It was about as big as all of these installments put together.
As I read it I was MORE convinced of Mid-tribulationism.
I used to argue this with people a lot (about 20 years ago). The point by point analysis is exhaustive and not really all that fruitful, I discovered. I focus now more on just the gospel and leave these arguments to those steeped in it. I do think the Left Behind stuff is setting a LOT of people up for disappointment, though - and possibly falling away.
I will disagree with you on a couple points. Obviously, I firmly believe in pretribulationalism. Also, I don't believe that people lose their salvation if they are Born Again.
How could you??? The Left Behind Stuff encourages people to accept Jesus NOW...Before the Rapture happens as well as before one may die prematurely...
The other view(s) tell you, 'don't worry about it'...You're good as a sinner until you see the signs appearing...If we are wrong about the Rapture (and I know we're not), we go thru the Tribulation...If you are wrong, many people are probably going to Hell who don't have to...