The Church teaches us that it is divided into the Church Triumphant (which includes the members of the Church in heaven), the Church Suffering (this includes the members of the Church in purgatory), and the Church Militant (this refers to those members of the Church who are alive in this world). Because we are part of the Church Militant, we are in a spiritual warfare and this spiritual warfare requires that we recognize, as Saint Paul teaches us "For our wrestling is not against flesh and blood; but against principalities and powers, against the rulers of the world of this darkness, against the spirits of wickedness in the high places." (Ephesians 6:12)
The members of the Auxilium Christianorum should always bear in mind the reality of our state as members of the Church living in this world. Despite St. Paul's teaching, many Catholics do not take seriously their obligation to wage war against the demonic forces. It is for this reason the Association of the Auxilium Christianorum was founded.