"And if Purpose Driven is just a method, as you say, then how is Rwanda a Purpose Driven nation (as reported by Warren)?"
I have no idea, nor is it my concern. What I do know is that the Purpose Driven method works for my church and that is my concern.
How can you define and defend the Purpose Driven method (and Warren), if you do not have any idea how/why Rwanda is called a Purpose Driven country?