The Bible is a collection of myths and legends derived from neighbouring peoples from the Middle East and Eastern Mediterranean. Examples include the Sumerian creation epic Enuma Elish from which the Genesis Creation Story was probably derived, probably via the Canaanites/Phoenicians, and the Noah story is almost identical to the story of Utnapishtim in the epic of Gilgamesh.
It's the word of men, not of the mythical supernatural beings that figure in many parts of it.
Belief in God and other supernatural beings is no different from ancient beliefs in gods and goddesses. The idea of the biblical God changes throughout the course of the Bible as does the name, and there seem to be several changes of Deity. For example:
- The God in Genesis creation story, is called Elohim. The Elohim are the sons of El in the Canaanite pantheon. They were ruled by El Elyon (God Most High), and later by Hadad the rain god, who is generally the god referred to by the title Baal (Lord). In Genesis 14:18-22, Abram is blessed by Melchizedek, the Canaanite High Priest of El Elyon and king of Salem, and Abram accepts the god as his.
-The enemy of the Elohim is Yam (the sea), a chaos monster slain by Baal. This might have been derived from the Sumerian creation epic Enuma Elish, in which the god Marduk battles the great dragon Tiamat (the waters of chaos, and mother of the gods) and divides her body to create the heaven and the earth. In Genesis 1, God's Spirit moves upon the face of the waters (verse 2) and then divides them (verses 6-7). Marduk hangs up his bow after his victory over Tiamat, much as God does in Genesis 9:13 after the Flood.
- When Moses encounters God, God introduces himself as Yahweh (I am who am, I will be what I will be, etc). Continuity with previous beliefs is maintained by the claim to be the God of Abraham, Jacob (Israel) and Isaac.
- In Acts 17, Paul further assimilates the attributes of Greek gods into the deity, when he identifies the "unknown god" as the one he is teaching about.