I really like your thought, that "The purpose of life is to discover the purpose of life". I'm not atheist, although not very religious too and I'm not person who feel any happiness, really until now I can't define what happiness is, if happiness is about money, relationship, social interaction, belongings, success, etc. I will disagree with it, I can feel 'happy' when I'm read some papers, re-proving theorem or coding. I don't know if this kind of 'happy' really a happiness or just my brain that make this things a happiness.