The existence of the universe is such a powerful proof of the existence of God that only a fool could and would deny that fact. Most people capable of reading and discerning are well aware of the multiple levels of “proof” for the existence of God.
The Bible presupposes the existence of God. “In the beginning God created the heavens and the earth.” Genesis 1:1.
While the First Cause does not automatically point to the God of the Bible, with a little thought it quickly becomes apparent that it can be no other. For example, there can be only one Greatest Conceivable Being. This fact eliminates all religions that are not monotheistic.The Bible teaches that God can be known through faith, the result of which is a revelation from God to us about Himself. Even those fools who purport to live by reason alone soon succumb to the need for faith to support their own arguments. This is a result of the fall in which sin limits our ability to rationally understand anything.