YEARNING FOR HEAVEN

I think it is a necessity in life to believe in a power above us especially in times of grieve and hopelessness. Some people think they are strong enough to exist alone without any believes in Religion until something horrible happens to them.
Is heaven above us up there somewhere? Or can it exist in us? How do we perceive something we cannot see?
What is our destination and duty in this world? Can one person make a difference? Are we chosen to help good conquer evil? Is it important for us to do good things and help the world be a better place to live? Every one of us is only a small point in the universe but all these small points together are what make the world go round.