Since the text you provided goes back to the first page of The Purpose Driven Life where Warren lays the foundation for his book, it's really best we start there or we'll probably talk right past each other as so often happens on these threads.
Also, I think it's important to read the statement of faith at Warren's church. You can read it here. I've pointed that link out to others who share your concerns and as best I could tell, they believed it was solid. Please check it out and see for yourself.
Those are bold claims! Is The PDL a guide to a 40 day Spiritual Journey? What is a Spiritual Journey?
When studying Scripture it's imperative to undererstand the culture of the times, the audience, it's history, etc. The Bible studies I lead help the students to better understand the text by understanding the times, culture, customs and audience to whom the text was written. In the same way we need to realize the times, culture and audience to whom Warren is writing.
We're living in those times and culture, but who is Warren's target audience? If his target is the unsaved, the non-Christian, the unchurched, the unregenerate as it seems to be, would that audience critique his book with such questions? I don't believe so and that may be where we differ.
This is part of what I mean by style. Before we move on, and we will cover each point you listed in the post to which I'm responding, let's try to come to some agreement as to Warren's audience. To whom do you think Warren is writing?
"You discover your identity and purpose through a relationship with Jesus Christ. If you don't have such a relationship, I will later explain how to begin one."
Given the above statement, and given the fact that churches world-wide have done The PDL congregation wide, I would assume that it is written to the believer and unbeliever.
Regards,