This is true of rebuilding antique cars, or repairing current models. If you will agree that people and human relational systems are also complex, you should agree that fixing people and relationships will require knowledge of creation's purpose for humanity. This is why I say that Creation's Design and Purpose is about much more than a single theme. The work of evangelism is described by the Apostle Paul as the Ministry of Reconciliation. If so, Creation's Design and Purpose is about all of life.
Warfare exists where two kingdoms are in mortal conflict.
The kingdom of Satan has declared war on the kingdom of God, and vice versa. One primary strategy in battle is to spoil the intent of one's adversary. God will undo the works of the Evil One. But, for now, Satan has avowed to deface the Creator's purpose for his ultimate creation, man. Man was created according to Genesis 1 not after any other pattern but God himself.