John Wimber uses this analogy for the church stating the following.
In the nearly 2,000 years since Jesus Christ commissioned His disciples to go into all the world and make disciples, the Church has made its mark on civilization. Empires have risen. Lands have been conquered. Great works of art have been created. Libraries full of theological and philosophical arguments have been erected, all in the name of Christ. The cultural legacy of Christianity has truly been magnificent.
But it's not war, and the Christ life is warfare. ... A war between the Kingdom of God and the kingdom of Satan. ... Warfare implies an enemy.
Wimber then related a story from the beginning of World War I. The war ministry of London dispatched a coded message to one of the British outposts in the inaccessible areas of Africa. The message read: "War is declared. Arrest all enemy aliens in your district." The war Ministry received this reply: "Have arrested four Germans, six Belgians, four Frenchmen, two Italians, three Austrians and an American. Please advise immediately who we are at war with."
The situation seems ludicrous. How can you fight a war unless there's agreement about who the enemy is? As Christians we are in a declared war, but unless we're clear about whom the enemy is, we'll waste time fighting enemies who aren't enemies at all.
Be sober-minded; be watchful. Your adversary the devil prowls around like a roaring lion, seeking someone to devour. - 1 Pet 5.8