Can one exist without acknowledging a creator

no one can not exist without acknowledging him by service.

I believe in god. I owe him my very existence. He the creator does not want me to acknowledge each and everything that this happening to me. My gratitude is expressed in silence and to that extent I am sincere. There is no need to do any thing ostensibly.

yes, but he will be so miserable. I think we should appreciate our life here in earth by thanking our creator. If someone gives you a gold for free you will say "THANKS" for the appreciation. But God gives us LiFE...more than gold. So that person who doesn't acknowledging god may not be so blessed.