To believe in the existence of the Creator, may He be blessed, i.e., that there is an Existence that is perfect (and absolute) in all facets of existence. He is the cause of all that exists, the sustenance of all, and through Him all is maintained. There is no possibility that He does not exist because without Him, all existence would cease to be and nothing would remain. [Whereas] if we would imagine the absence of all existence other than His, the existence of God would neither cease nor diminish. For He is self-sufficient in His existence, He suffices in Himself, and His existence requires nothing other than Himself. [For] among the intelligences -- the angels and the constellations and all that they contain and all that is below them -- they all need Him for their existence. This is the first Principle, as affirmed by the verse (Exodus 20:2) "I am God, your Lord..."
It may seem easy to play with the idea that the Bible is a book like many other books," a "fairy tale," but "consider what such denial implies. If Moses and Isaiah have failed to find out what the will of God is, who will? If God is not found in the Bible, where should we seek him? If God had nothing to do with the prophets than He has nothing to do with mankind."