Well, of course - we all need purpose and meaning in our lives, atheists are no different. What I see as a bit egotistical is this idea of a "higher purpose" being bestowed upon us from this ultimate authority.
I just want to explain this, because my view is nothing like the Christian view.
I do not believe that God created man for some wonderful purpose.
I believe that the individual (including any form of life) is an actual part of God. Our existence is natural, it was not a decision made. So I guess 'purpose' might not be the best word to use, except that perhaps the idea that there is something more gives me a sense of purpose, or something to work toward. When I imagine a reality where there is only this life and nothing beyond, then I feel devoid of purpose. Nothing seems important any more. But that feeling never lasts because I end up coming back to the very strong feeling that 'there must be more'.
In the end, we all percieve the world differently. I understand the logic behind atheistic perception, but I can't seem to adopt it and more importantly, I really wouldn't want to. It would compromise my self or self as well. I just...can't see the world without God. That probably has something to do with my concept of God. I don't know. But I can't help but feeling justified in my feelings. Oh well.