Nothing per Islam religion is called war against non believers. Muslims are commanded by God to treat non Muslims kindly and with respect except those who attack Muslims and try to deprive them from their lands and try to force them to convert from Islam. Some understand Jihad as holy war which is wrong. Jihad is an Arabic word that means struggle. All of us; irrelevant to faith, religion, race, or culture; are practicing Jihad (or struggle) to achieve better career, better job, earn money for life, improving health and life conditions, ...etc.
Refer to questions below for more information.
It is called Jihaad. But it can be fought only against Fitna, disturbance under certain conditions. Killing any innocent human being, irrespective of religion, caste or creed, is considered like killing whole humanity in Islam. Anybody doing so will go to hell according to the Qur'an.
Jihad
jihad
Crusades
No, he only fought against the Muslims that were trying to enter France and Europe.
To regain the Holy Land from the Muslims.
The Crusades were a series of holy wars fought between Christians and Muslims for control of Jerusalem and the Holy Land during the Middle Ages. The First Crusade was launched in 1096 and resulted in the capture of Jerusalem by Christian forces in 1099. Subsequent Crusades followed over the span of two centuries.
To take back the Holy Land in Jerusalem from the Muslims
It is more a holy war .
Of course not. Catholics consider Muslims unbelievers. All religious believers will consider themselves as true believers. However, Muslims don't consider Catholics, or Christians in general, unbelievers. Muslims consider Christians (as Jews) people of the book because Musilms believe in the holy books of the Bible and the Torah.
To take back the Holy Land in Jerusalem from the Muslims
Muslims. But the true goal of the crusades was to get rich.
During the Crusades, European knights, such as those from England, France, and Germany, fought against Muslim forces in the Holy Land, particularly against the Saracens, who were a diverse group of Muslims from the Middle East and North Africa. These knights were part of the military orders like the Templars, Hospitallers, and Teutonic Knights, who were dedicated to protecting Christian pilgrims and territories in the region.
The Crusades.