Demons are always in the ready to battle against the believers to make them weak and unable to do God’s will.
Fallen angels are those who have abandoned their position and rebelled against the LORD in heaven to follow Satan due to his deceiving them.
3 Then another sign appeared in heaven: a huge red dragon with seven heads, ten horns, and seven royal crowns on his heads. 4 His tail swept a third of the stars [angels, the sons of God] from the sky, tossing them to the earth. And the dragon stood before the woman who was about to give birth, ready to devour her child as soon as she gave birth.-Revelation 12:3-4, BSB [Emphasis added]
Satan deceived one third of the angels in heaven to follow him. Those are the ones that are identified in the Scriptures as demons. The word demon means an evil spirit who are angels, as seen in Revelation 12:7, in which a big war takes place in heaven. Satan attempts to take God’s throne but loses that war. The dragon who is Satan fights against Michael and his angels with his fallen angels who are known as demons. The word demon is to show the state [character] of Satan’s fallen angels. After the angels abandoned God, they became pure evil with hatred towards God and his followers in heaven and on earth.
6 And the angels who did not stay within their own domain but abandoned their proper dwelling—these He has kept in eternal chains under darkness, bound for judgment on that great day.-Jude 1:6, BSB
Some angels got judged immediately as those mentioned in the Book of Jude and in the Book of 2 Peter 2, for corrupting humanity in the days of Noah and abandoning their positions in heaven.
4 For if God did not spare the angels when they sinned, but cast them deep into hell, placing them in chains of darkness to be held for judgment; 5 if He did not spare the ancient world when He brought the flood on its ungodly people, but preserved Noah, a preacher of righteousness, among the eight-2 Peter 2:4-5, BSB
When we go to Genesis 6, it reveals why the angels rebelled against the LORD.
1 Now when men began to multiply on the face of the earth and daughters were born to them, 2 the sons of God saw that the daughters of men were beautiful, and they took as wives whomever they chose.
3 So the LORD said, “My Spirit will not contend with man forever, for he is mortal; his days shall be 120 years.”
4 The Nephilim were on the earth in those days—and afterward as well—when the sons of God had relations with the daughters of men. And they bore them children who became the mighty men of old, men of renown.-Genesis 6:1-4, BSB
In verse 2, the phrase “the sons of God” refers to angels as we see this in the Book of Job 1:6 which says, “6 One day the sons of God came to present themselves before the LORD, and Satan also came with them.”
The phrase “they took as wives whomever they chose” could be explained in a couple of ways. First of all, we see that angels were not created to procreate. We see this in Matthew 22:30 which says, “30 In the resurrection, people will neither marry nor be given in marriage. Instead, they will be like the angels in heaven.”
So how can angels (fallen angels) in Genesis 6, take wives for themselves? Either they possessed human bodies or transformed their bodies so that they were able to have relations with their wives, and their children were the men of renown or famous ones.
The phrase “The Nephilim” which means the giants are not the results of angels having relations with the daughters of men. The construction of verse 4, cannot suggest that the Nephilim are the angel’s offspring because it says, “The Nephilim were on the earth in those days—and afterward as well—when the sons of God had relations with the daughters of men.” It says that the Nephilim were already there when the sons of God (the fallen angels) took wives for themselves and had children that were famous. The Nephilim whomever they were, continued to exist until the flood came upon the earth which wiped out humanity (except for Noah and his family) and put the sons of God, the fallen angels, into chains in hell (2 Peter 2:4-5).
In Numbers 13:32-33, it says, “32 So they gave the Israelites a bad report about the land that they had spied out: “The land we explored devours its inhabitants, and all the people we saw there are great in stature. 33 We even saw the Nephilim there—the descendants of Anak that come from the Nephilim! We seemed like grasshoppers in our own sight, and we must have seemed the same to them!”
We must understand that everyone in the post-flood era were destroyed and the sons of God (fallen angels) were cast into hell and chained up until judgment day. So, the word “Nephilim” mentioned in Numbers 13:33 suggests that the people there were giants and it reminded the Israelites of the portion of Scripture that spoke about the Nephilim. The Bible clearly records that only 8 people survived the flood.
Genesis 6, gives us a picture of how angels became bad, and those fallen angels were judged in the time of the flood for making men evil through their influence of sexual immorality.
Lust for a believer in Christ comes through images that are placed in their minds by demons. These creatures fell because they also lusted after women to experience that which was forbidden to them (Genesis 6:2). When a person lusts, they are carrying out the desire implanted by the demonic influence.
Not all of the fallen angels participated in the time of the Nephilim. There seems to have been two rebellions in heaven. The first happened when Satan deceived them and was kicked out of heaven. The second wave was when they got tempted with the daughters of men and abandoned God for them. The demons of today are the angels of the first wave of the rebellion who deceives the world through idolatry (the worship of idols).
1 While Israel was staying in Shittim,a the men began to indulge in sexual immorality with the daughters of Moab, 2 who also invited them to the sacrifices for their gods. And the people ate and bowed down to these gods. 3 So Israel joined in worshiping Baal of Peor, and the anger of the LORD burned against them.-Numbers 25:1-3, BSB
Demonic worship has two components. The first one is aimed at one’s sexual lust and the second is through idolatry. The demons use sex to entice an individual to eventually worship another god. Their main goal through lust is to get you to worship something else rather than Jesus Christ, the one true God.
Demons dwell behind idols to take away the worship due to God towards them through the idols which the demons have put in men’s heart to create.
16 They provoked His jealousy with foreign gods; they enraged Him with abominations. 17 They sacrificed to demons, not to God, to gods they had not known, to newly arrived gods, which your fathers did not fear.-Deuteronomy 32:17, BSB
Foreign gods are idols.
19 Am I suggesting, then, that food sacrificed to an idol is anything, or that an idol is anything? 20 No, but the sacrifices of pagans are offered to demons, not to God. And I do not want you to be participants with demons.-1 Corinthians 10:19-20, BSB
The demons by Satan’s command have just one purpose. It is to make you abandon the Lord Jesus Christ and His Word so you will be unable to do His will (Genesis 3). They want you to rebel just as they did because of their hatred towards God.
All Scriptures are taken from the Berean Study Bible version (BSB). Permission has been acquired.