2 Chron. 11:15, where it means "hairy," or "he-goat." All four verses deal with offering of sacrifices to idols. In the New Testament Greek, "devils" appears in 44 verses, and is translated as such from δαίμων (daimōn), meaning "demon"; δαιμόνιον (daimonion), meaning "evil agents of Satan"; and δαιμονίζομαι (daimonizomai), meaning "to be under the power or possessed of a demon or devil."
Unfortunately, none of the verses tell us what demons are, or from where they came. We know angels existed before the creation of the Universe, from Job 38:4-7, which says, "Where wast thou when I laid the foundations of the earth . . . Whereupon are the foundations thereof fastened? Or who laid the corner stone thereof; when the morning stars sang together, and all the sons of God shouted for joy?" See my post dated 7-18-13 for an explanation of "morning stars" being angels.
We know that a third of the angelic beings joined Satan and were cast out of heaven with him, from Dan. 8:10, which says, "And it waxed great, even to the host of heaven; and it cast down some of the host and of the stars to the ground, and stamped upon them." A cross reference for that verse is
Rev. 12:4, which says, "And his tail drew the third part of the stars of heaven, and did cast them to the earth: and the dragon stood before the woman which was ready to be delivered, for to devour her child as soon as it was born." But we still cannot be dogmatic in stating that demons are fallen angels.
One piece of evidence which does seem to support that they are one and the same, is found by comparing Matthew 9:34 with 25:41: "But the Pharisees said, He casteth out devils through the prince of the devils."; and "Then shall He say also unto them on the left hand, Depart from Me, ye cursed, into everlasting fire, prepared for the devil and his angels." But unfortunately, Jude 1:6 and 2 Pet. 2:4 say that the fallen angels are presently bound by chains in darkness, awaiting judgment. So, the bottom line: I do not know!
The only things one has to know from the Bible:
Because we sin, and the punishment for sin is death, someone had to die for us to be saved!
Jesus was crucified, buried, and rose from the dead for us, according to the Scriptures!
If we trust in Jesus as our Savior and Lord, we become the children of God! Praise Him!!!