I want to answer that question by getting to the point and not writing in circles. Here I go!
Primarily, we don’t need to find a purpose. We need a Savior who finds us.
The epicenter and focus of the Purpose Driven movement becomes about finding your purpose. The general idea is that there are all of these tasks and problems in the world that need solving, and God has created people to meet those needs, and we need to find out what task/problem we are to solve.
Jesus and the gospel become a means to that end. The thing is, Jesus didn’t die so we could find a purpose or big dream to accomplish for this life. We don’t need a purpose, we need a Savior.
The Purpose Driven movement has it all backwards. On paper the PDM will say it’s about God and not you, but in actuality it becomes all about you as you focus over and over again on YOUR purpose.
They’ll take Ephesians 2:1-10, and turn the emphasis on the works we do, instead of putting it on the Savior we need.
2 And you were dead in the trespasses and sins 2 in which you once walked, following the course of this world, following the prince of the power of the air, the spirit that is now at work in the sons of disobedience— 3 among whom we all once lived in the passions of our flesh, carrying out the desires of the body[a] and the mind, and were by nature children of wrath, like the rest of mankind.[b] 4 But[c] God, being rich in mercy, because of the great love with which he loved us, 5 even when we were dead in our trespasses, made us alive together with Christ—by grace you have been saved— 6 and raised us up with him and seated us with him in the heavenly places in Christ Jesus, 7 so that in the coming ages he might show the immeasurable riches of his grace in kindness toward us in Christ Jesus. 8 For by grace you have been saved through faith. And this is not your own doing; it is the gift of God, 9 not a result of works, so that no one may boast. 10 For we are his workmanship, created in Christ Jesus for good works, which God prepared beforehand, that we should walk in them.
I extracted most of my entry from some ideas in this lecture by Chris Rosebrough.