There are two pillars to build a belief in God upon; both involve nature. One is the law of nature, specifically human nature. The other is the physical nature, creation around us. These two pillars form the basis upon which we can build our case for the logic surrounding belief in God.
Physical nature, all that we see around us tells us much about the existence and even the character of God. We must be careful relying solely on creation to build our belief and understanding of God. While creation is magnificent, amazing and powerful, all of which display characteristics of God, it can also be harsh and chaotic, certainly not attributes that should be ascribed to God.
The old-timers understood the Law of Nature differently than we do today. They thought of the Law of Nature in regard to mankind. We today more often think of the term in regard to laws such as gravity. Is it really a law that a rock falls to the ground when released from your hand? Does the rock have a choice in the matter? On the other hand we decide whether we are going to obey the law that tells us not to steal.