There is a problem. If we do not know who we are then how can we even consider immortality.

This is true, indeed. What's the point of considering immortality if we remain unclear about our true identity - no understanding of who we are or what exactly would be made immortal...

As for spirituality, I do believe that we have a spirit in us and there's a future beyond the grave. This gives me comfort, especially since I have someone so close to me (my mother) who has departed from this world. And I thought: the happiest moment of my life was the saddest moment of my life - sad because she had to go; happy because she's free from suffering and has moved on to somewhere wonderful.