The Bible does not focus on angels dying
Scripture does not give a detailed explanation of whether every angelic being can die. Jesus says that those raised to eternal life cannot die and are like the angels in this respect, which strongly suggests that angels are not mortal as humans are (Luke 20:36). But the Bible's main concern is not angelic biology. It is loyalty to God, rebellion against him, and the outcome of that rebellion.
So a spiritual battle need not have death as its goal. Think of it more as a conflict in which one side seeks to oppose, hinder or corrupt, while the other carries out God's will. The result can be loss of position, restriction, exposure, or judgment rather than physical death.
Neither can they die any more: for they are equal unto the angels; and are the children of God, being the children of the resurrection.
Spiritual battles can affect real people
Daniel's prayer gives a striking glimpse behind the scenes. An angel tells Daniel that a spiritual ruler called the prince of Persia resisted him for twenty-one days, until Michael came to help (Daniel 10:12-13). The passage does not describe swords or deaths. It does show resistance delaying an angel sent with an answer for Daniel.
That helps explain the point of such conflict. Angels are sent to serve God's purposes, while hostile powers oppose those purposes. In the New Testament, Paul says believers' deepest struggle is not against human enemies but against spiritual powers of evil (Ephesians 6:12). This is why Christians are called to stand firm through truth, faith, prayer and God's strength, rather than treating other people as the enemy.
Then said he unto me, Fear not, Daniel: for from the first day that thou didst set thine heart to understand, and to chasten thyself before thy God, thy words were heard, and I am come for thy words. But the prince of the kingdom of Persia withstood me one and twenty days: but, lo, Michael, one of the chief princes, came to help me; and I remained there with the kings of Persia.
Jesus showed that evil can be driven back
When Jesus cast out demons, he did not treat the moment as pointless because the demons continued to exist. Their expulsion showed that God's reign was breaking into a world held captive by evil. Jesus connected the driving out of demons with the arrival of God's kingdom (Matthew 12:28).
He also described binding a strong man before taking away what that strong man had guarded (Matthew 12:29). The image is about overcoming power and releasing what was under its control. A demon being forced out, silenced, or forbidden to harm someone is a genuine defeat, even if it is not annihilated.
But if I cast out devils by the Spirit of God, then the kingdom of God is come unto you.
The final outcome is judgment, not an endless stalemate
The Bible does not portray God and Satan as equal rivals locked in an uncertain war. In Revelation, Michael and his angels fight the dragon and its angels, and the dragon is cast out of heaven (Revelation 12:7-9). Being cast out is a decisive loss of place and authority.
Revelation later speaks of the devil's final punishment (Revelation 20:10). Christians differ on some details of how to read Revelation's imagery and timetable, but the central hope is clear: evil does not endure unchallenged or rule forever. God judges it.
That means these battles matter. They reveal God's justice, protect and strengthen his people, expose evil for what it is, and move history towards God's promised victory. When this topic feels mysterious, it is wise to hold the unanswered details lightly and keep reading the passages themselves.