We don't know and we won't know until and only then, if.....and there's nothing we can do about the mysteries and finality of life. It's a gift and the moment we are in is the only guarantee. Great question that reminds those of us lucky to be alive to make the best of each moment.
I believe that the miracle of life is not chance, that each of us has a purpose and there is meaning in all life. I believe in a higher power with a plan. The complexity of every cell of every living thing takes a lifetime to understand a small fraction of what the world holds; if humanity reveres the value in a work of art, it follows that our creator values the masterpiece of each being.
Spirituality is a personal component, as individualized as each person. I do not believe any manmade concepts relegating organized religion as the "be all, end all", knows the answers regarding the final journey. Organized religions have been the instigator of too many wars to proclaim "holier than thou". I just read about a study in progress at University of Missouri that associates the right parietal lobe of the brain as being connected to feelings of selflessness and spiritual transcendence. Scientists are studing the hypothesis that spirituality is the result of brain function, which means that spriritual experiences aren't just limited to believers. In fact, the studies show that patients with the most damage to their right parietal lobe were the ones who reported the most spiritual feeling. (Riverfront Times, May 10-16, 2012).
Ultimately, we are products of our genetics, upbringing and experiences. Throughout our lifetime, we are in a state of flux, changing, evolving and discovering. The final questions, however, we will only know, if that is the plan and when the time comes.