Thirteen Attributes of Mercy

Jews believe that all existence in heaven and on Earth comes from God, and that God alone should be worshipped. Jews may describe the nature as of God as: 

The nature of G-d is one of the few areas of abstract Jewish belief where there are a number of clear-cut ideas about which there is little dispute or disagreement.

G-d Exists

The fact of G-d's existence is accepted almost without question. Proof is not needed, and is rarely offered. The Torah begins by stating "In the beginning, G-d created..." It does not tell who G-d is or how He was created.

In general, Judaism views the existence of G-d as a necessary prerequisite for the existence of the universe. The existence of the universe is sufficient proof of the existence of G-d.