To the Greeks, a demon was a spirit-being that was perceived to be a god or goddess. In the New Testament the word is a spirit-being of lesser power and authority than God. The two differing perspectives reflect very well the Biblical assertions concerning the origin of idolatry and false religions. In the Dead Sea Scrolls, in the Enoch literature it is found that unclean spirits originated with the spirits of bastards, specifically those bastards created by the watchers (fallen angels) when they mixed their seed with other kinds. Paul explains in Colossians chapter 2, and more clearly in 1 Corinthians chapter 10, that these demons are the sources of the world's false religions. Paul says that “whatever the Nations sacrifice, they sacrifice to demons, and not to Yahweh”.
In Psalm 95 verse 5 in the Septuagint, the verse reads “For all the gods of the nations are demons: but the Lord made the heavens.” The King James Version has only idols at that verse. We also see the Greek word for demons at Isaiah 13:21 and 34:14, where the King James Version has satyrs and wild beasts instead.