How should our war be?
“And why should ye not fight in the cause of Allah and of those who, being weak, are ill-treated (and oppressed)? - Men, women, and children, whose cry is: "Our Lord! Rescue us from this town, whose people are oppressors; and raise for us from thee one who will protect; and raise for us from thee one who will help!" Those who believe fight in the cause of Allah, and those who reject Faith Fight in the cause of Evil: So fight ye against the friends of Satan: feeble indeed is the cunning of Satan.” (an-Nisa, 4/75-76)
When the verses related to war are studied, it is seen that Islam allows it only to remove oppression, pressure due to religion and unjust attacks.
Since Allah does not need anything, to fight for His consent means to fight for the benefit of His servants and to ensure freedom of religion and conscience.
Those who do not believe in Allah and the true religion also have gods and - material, spiritual - leaders that they obey. These leaders are Satan and transgressors according to the Qur'an.
The purpose of war of those who are subject to them is not the realization of law and justice but the satisfaction of their egos, oppression, pressure and exploitation. When the wars they made throughout history are studied, it is possible to see many horrifying examples of this divine determination.
The purpose of man's creation is worshipping Allah and submission to Him. Servitude and obedience is an indivisible whole.
Man cannot fulfill the duty of worshiping, cannot get rid of polytheism and cannot be a person of oneness unless he leads his life – as an indivisible whole - in the consciousness of being a slave of Allah and looking for His will and consent.
As Garaudy puts it,
"It is necessary to pay attention to the following fact in order to understand why Prophets insistently invited people to be a slave of real Allah, who is one, and to abandon worshipping of other powers (taghut) other than Allah: the real source of evil and corruption is some people being gods of others either directly or indirectly."
"When you examine history, you will see that people are not godless and that they either worship the real God or they obey people, groups, classes and parties that put themselves in the place of God."
"It is necessary for people to believe in a superhuman power and a greater and loftier reward than the pleasures of the world life in order to be able to establish social balance. If people do not recognize the divine authority and are unaware of the reckoning of the Day of Judgment, they will live as prisoners of the borders of their own souls. A person who replaces Allah with man will also replace man with himself because another person does not have a different property from him (he is also a human being)."
"The goal of those who do not have any expectations but the world life and worldly pleasures will be getting the biggest share from the world; its inevitable result will be egoism, material pragmatism, oppressing and exploiting the weak."
The following answer given by Rib'iyy b. Amir, a Muslim, at the beginning of the War of Qadisiyya to the question of Rustam, the commander of the Persians, "Why did you come here?" is an eloquent expression of the universal purpose:
“Allah sent us to deliver those whom He wished from worshiping slaves to worshiping Allah, from the constriction of this world to the vastness of this world and from the oppression of the (distorted) religions to the justice of Islam. Allah sent us to your people so that we will call them to the true religion.”
The aim of the Islamic conquests is ensuring freedom of religion, conveying the message of the true religion and the establishment of justice.
There is no compulsion in religion and Allah does not love oppressors.