Well, if we are just piles of goo that randomly became sentient, then there's no objective "need" for purpose; we can simply keep existing and eating and sleeping until we die and decompose.
However it seems obvious that most people, at some point in their lives, wonder about purpose and meaning--which raises the question of why we wonder. Is there something planted within us that causes us to seek answers to these questions?
> or morality
I suppose the sociological answer would be that morality provides guidelines for behavior which help society operate smoothly, as opposed to everyone doing whatever they want, stealing and killing without consequences, which would prevent any kind of civilization from developing.
Which I guess raises a chicken-and-egg question: where did morality come from? How did the first guy who realized that chaos was holding civilization back (before "civilization" even?) convince everyone else to stop doing what they were doing and follow these rules he came up with? "Hey, man, don't steal my stuff and kill me. If you do, we'll keep having chaos, and we'll never be able to develop a society and make progress." Somehow I doubt that would have been convincing to a wild-eyed savage who was in the habit of raping and pillaging.
> and why ask that of your god?
I think this depends on who your god is--or more specifically, whether you believe a god exists. If there isn't one, and we are our own arbiters of truth and morality and meaning, then I suppose it's personal preference whether you care about these things; many people seem happy to live in ignorant bliss, and then they die, and what does it matter?
But if you believe that a god does exist, who created us, who exists outside of our universe, then said god would necessarily have the power over our life and death, and any afterlife that may come, and so it would seem sensible to inquire as to what that god wanted of us--just as a child tries to please his parents if he wants his parents' approval and support, or a soldier tries to please his superiors, or an employee tries to please his employer.
Of course, many people either don't believe or don't care, and time will tell how it turns out for them. In the end, we'll all find out whether a god exists and whether there's an afterlife.
That is where we disagree I think.