God sends "rains from heaven and fruitful seasons, satisfying your hearts with food and gladness.” It's not just that God exists. It's not merely that he is the Creator. There is evidence of his goodness, grace, love, provision, and protection all around us. Will we ignore it? Or will we recognize him as the giver - given the evidence he has left for us?
Martin Luther wrote in his catechism 500 years ago that God does all these things only out of fatherly divine goodness without any merit or worthiness in me. For all this, he says, it is my duty to thank and praise, serve and obey him.
God is not without witness and we are not without proper response. We are to thank, praise, serve, and obey God for all his good gifts.