Rapture is a daft name for the equally daft 'second coming' concept!
That's not what many Christians mean by "Rapture". Specifically, that is not what is meant in the Left Behind series that you mentioned.
So, so far we have an opening post by someone who does not know what she means, so what hope is there of a sensible discussion here?
FYI, I don't think the Left Behind stuff is particularly biblical.