(don't know why this didn't show the first time)
You'd have to ask them. If they are intent upon offending everyone and challenging their worldviews, the statement is sufficient, isn't it?
The Gospel is not about what we do, but what Christ has done for us. If Rev. Warren's goal, as should be the goal of all Christian pastors, was to preach the Gospel, he failed. What he likely did do in his repeated mention of his buzzword "purpose" was to peddle his book.
Well, that's for God to decide.
I have always looked at such words those in his quote) as comfort to hurting Christians rather than an outreach to sinners.
Both have their place.
And there is not one thing wrong with finding God's purpose in our lives.