Can Christians serve in war or use force in self defense?
By Will Bourne · Question 135
The direct answer
Christians have long disagreed about this. Some understand Jesus' teaching to require nonviolence. Others believe limited force can be used to protect life under strict moral restraints. I do not treat killing as spiritually casual, even when it is legally authorized or claimed to be necessary.
Fuller explanation
Military service includes many roles and does not make every service member personally responsible for every policy. It also does not make every command morally right. Conscience and the duty to refuse wrongdoing remain.
Self-defense raises an immediate duty to protect life, including another person's life. The goal should be stopping the threat, not vengeance. Proportionality, necessity, and protection of the innocent matter.
Christians should not romanticize violence. Christians should support those carrying moral injury and examine the decisions made by leaders who send others into danger.
The objection we still need to face
Does love of enemies mean allowing someone to murder an innocent person?
That is one of the strongest objections to absolute pacifism. A nonviolent Christian must explain protection without evasion; a Christian permitting force must explain how the limits remain faithful to Jesus rather than simply baptizing national violence.
Scripture and its use
Matthew 5:38–48; Luke 3:10–14; Romans 12:17–21; Romans 13:1–7; John 18:36
Christian traditions differ on military service and force. This answer identifies moral questions rather than certifying a particular war, weapon, order, or act of self-defense. Military service alone does not establish that a person has moral injury; individual support and assessment require attention to that person.
Read these passages in their surrounding chapters alongside the explanation.