I am a Secular Humanist. I believe the human spirit is a mental faculty on a par with Reason, Emotion, Intuition, Conscience, etc. As I get older, I am learning at a faster rate than ever before. For each answer discovered there are three new questions also uncovered; it looks like I'll be busy, permanently.
There is no greater purpose for one's existence than their own personal happiness and helping the rest of humanity, within the sphere of your influence, achieve their own personal happiness. With that goal in mind, you better get off your ass and get busy.