Demons are fallen spiritual beings — angels who rebelled with Satan and were cast out of heaven (Luke 10:18; 2 Pet. 2:4; Jude 6). They are personal, intelligent, malevolent entities who actively oppose God's Kingdom and seek to destroy, deceive, and enslave human beings. Scripture shows them causing physical affliction, mental torment, spiritual blindness, and idolatrous worship. Jesus' earthly ministry prominently featured casting out demons — demonstrating His authority and the arrival of the Kingdom. Demons know who Jesus is (Mark 1:24) and tremble before God (James 2:19). They are already defeated at the cross, yet remain active until the final judgment.
DE'MON, n. [L. daemon; Gr. daimon.] 1. A spirit, or immaterial being, holding a middle place between men and the celestial deities of the pagans. 2. In the Christian theology, an evil spirit or devil, one of the fallen angels, who is considered as residing in a person and tormenting or vexing him; or as ruling over a country, and with others, maintaining the kingdom of Satan. — Webster notes the Greek word was originally neutral (both good and bad spirits) but in Scripture always refers to evil spirits.
Western secular culture denies the existence of demons entirely, reducing all spiritual affliction to psychology and psychiatry. Meanwhile, pop culture trivializes demons through horror entertainment, gaming, and fantasy — making them aesthetic rather than actual threats. A more dangerous corruption exists within liberal theology, which spiritualizes demonic language ("the demon of racism," "the demon of addiction") while denying that personal evil beings exist. This leaves people unarmed against real spiritual opposition. C.S. Lewis noted the two errors: obsessive fascination and total disbelief — both serve demonic purposes.
Mark 1:24 — The demon cries out: "What have you to do with us, Jesus of Nazareth? Have you come to destroy us? I know who you are — the Holy One of God."
Ephesians 6:12 — "For we do not wrestle against flesh and blood, but against... the spiritual forces of evil in the heavenly places."
James 2:19 — "Even the demons believe — and shudder!"
1 Corinthians 10:20 — "What pagans sacrifice they offer to demons and not to God."
Colossians 2:15 — "[God] disarmed the rulers and authorities and put them to open shame, by triumphing over them in [Christ]."
G1140 — daimonion (δαιμόνιον): demon, evil spirit — the NT term (neuter diminutive) used for spirits cast out by Jesus
G1142 — daimōn (δαίμων): demon — used in Matt. 8:31
H7700 — shed (שֵׁד): demon, destroying spirit — Deut. 32:17; Ps. 106:37
"The man who dismisses the biblical teaching on demons is not more sophisticated than Jesus — he is less informed."
"Demons are not the equal and opposite of God. They are defeated creatures operating on borrowed time within limits God permits."
"Spiritual warfare begins not with dramatic confrontation, but with the daily disciplines that starve demonic footholds: truth, righteousness, prayer, and faith."