Answer: Angelology is the study of angels. There are many unbiblical views of angels today. Some believe angels are human beings who have died. Others believe that angels are impersonal sources of power. Still others deny the existence of angels entirely. A biblical understanding of angelology will correct these false beliefs. Angelology tells us what the Bible says about angels. It is a study of how the angels relate to humanity and serve God's purposes. Here are some important issues in angelology:
What does the Bible say about angels? Angels are an entirely different order of being from humans. Human beings do not become angels after they die. Angels will never become, and never were, human beings. God created the angels, just as He created humanity.
Are angels male or female? The Bible does not necessarily support the gender of angels being male or female. Whenever gender is “assigned” to an angel in Scripture, it is male (Genesis 19:10,12; Revelation 7:2; 8:3; 10:7), and the only names assigned to angels are Michael and Gabriel, generally considered masculine names.
Do we have guardian angels? There is no doubt that good angels help protect believers, reveal information, guide people, and, in general, minister to God’s children. The difficult question is whether each person or each believer has an angel assigned to him/her.
Who / What is the angel of the Lord? The precise identity of the “angel of the Lord” is not given in the Bible. However, there are many important "clues" as to his identity.
What are cherubim? Are cherubs angels? Cherubim / cherubs are angelic beings involved in the worship and praise of God. In addition to singing God's praises, they also serve as a visible reminder of the majesty and glory of God and His abiding presence with His people.
What are seraphim? Are seraphs angels? Isaiah chapter 6 is the only place in the Bible that specifically mentions the seraphim. The seraphim ("fiery, burning ones") are angelic beings associated with the prophet Isaiah's vision of God in the temple.
Angelology gives us God's perspective on angels. Angels are personal beings who worship and obey God. God sometimes sends angels to "interfere" in the course of humanity. Angelology helps us to recognize the warfare that exists between God's angels and Satan and his demons. A proper understanding of angelology is very important. When we understand that angels are created beings, just as we are, we realize that worshipping or praying to angels robs God of the glory that belongs to Him alone. It was God, not angels, who sent His Son to die for us, who loves and cares for us, and who alone is worthy of our adoration.
A key verse on angelology is Hebrews 1:14, "Are not all angels ministering spirits sent to serve those who will inherit salvation?"
Question: "What does the Bible say about demons?"
Answer: Demons are fallen angels, as Revelation 12:9 indicates: “The great dragon was hurled down—that ancient serpent called the devil, or Satan, who leads the whole world astray. He was hurled to the earth, and his angels with him.” Satan’s fall from heaven is symbolically described in Isaiah 14:12–15 and Ezekiel 28:12–15. When he fell, Satan took some of the angels with him—one third of them, according to Revelation 12:4. Jude 6 also mentions angels who sinned. So, biblically, demons are fallen angels who, along with Satan, chose to rebel against God.
Read more: http://www.gotquestions.org/demons.html#ixzz331HJ7WqD