XP preaches the values of community, simplicity, feedback and courage.
Important aspects of XP are its contribution to altering the view of the cost of change and its emphasis on technical excellence through refactoring and test-first development.
XP provides a system of dynamic practices, whose integrity as a holistic unit has been proven.
XP has clearly garnered the most interest of any of the Agile approaches.
Its not a cult, but its not far off !!