Should Muslims fight non-Muslims on grounds of their aggression or their disbelief?
The view held by the majority of Muslim scholars, depending on the Quran and Prophet's traditions in this regard, is that the aggression committed by non-Muslims is the main reason for fighting them. Being peaceful followers of another religion cannot be deemed a justification for fighting non-Muslims. The Qur‘an guarantees freedom of belief in the verse which reads "whoever wills - let him believe; and whoever wills - let him disbelieve"[18:29]. This verse makes it clear that it is impermissible to fight non-Muslims to make them convert to Islam. Otherwise, the Qur‘an would be paradoxical.