Moses, under the inspiration of God the Spirit, assumes no argument. A God capable of proof would be no God at all. His very name signifies immutability and confirms His eternality. The Scripture further confirms that men not only know that God exists, but also have certain ideas as to who and what He is. We see this in Rom.
Reference there is to the history of heathen idolatries.
He left it enough light in creation to witness His existence, confirmed in their pagan practices. Men everywhere believe in the existence of a Supreme Being to whom they are morally responsible and to whom propitiation is to be made. There is really no such thing as an atheist. Voltaire, the French atheist was found praying to God in a thunderstorm. Those who so diligently labor in their tireless efforts to prove the foolish theory of evolution and on the other hand vehemently oppose the doctrine and fact of divine creation do so, whether known or unknown to them from an innate fear.