I read your post...
Yea man, good point. I guess that sorta answers the question, "If a tree falls in the forest and nobody is around to hear it, does it make a sound?". Going along with your point, the answer is "no"; we only exist to the people we know, to all others, we are nothing but a grain of sand on the beach. And to give my thoughts on your questions...No, there is no God, and no, we do not have a purpose. It's thought processes like these that reinforce my outlook on, and the way I practice, life; I just go with it man.