Jesus did not fight against his enemies, so why was Prophet Muhammad a fighter?

Prophet Moses was a fighter, and so was Prophet David. Both Prophets, Moses and Muhammad (peace be upon them all), were in charge of the political and worldly affairs, and both of them emigrated from the pagan community. Moses took his people out of Egypt, while Muhammad's emigration was to Yathrib, and before that his followers had emigrated to Abyssinia escaping from the political and military authorities in the countries from where they fled for the sake of their religion. The call of Jesus (peace be upon him) was different as it was addressed to the Jews, who were not pagans, unlike Moses and Muhammad who lived in two pagan environments: Egypt and the Arab Peninsula, which made things harder and more challenging. The change that was contingent on the call of Moses and Muhammad (may Allah's peace and blessings be upon them) was fundamental and comprehensive, as it was a big leap from idolatry to monotheism.

Victims of the wars that took place during the lifetime of Prophet Muhammad did not exceed one thousand, taking into account that such wars were for self-defense, repelling aggression, or protecting religion. On the other hand, millions fell victims to wars that were waged under the name of other religions.

Moreover, the mercy of Prophet Muhammad (may Allah's peace and blessings be upon him) was manifest on the Day of the Conquest of Makkah and after Allah Almighty had granted him empowerment, as he said: "Today is a day of showing compassion". He issued a general pardon forgiving the Quraysh who spared no effort to hurt the Muslims, and meeting the offense and abuse with benevolence and kindness.

{Good and evil are not equal. Repel evil with what is good; the one whom you have enmity with will become as if he was a close friend.} [157] Surat Fussilat: 34.

Allah Almighty said about the traits of the pious:

{...and who restrain their anger and pardon people; for Allah loves those who do good.} [158] Surat Āl ‘Imrān: 134.