Who will Imam Mahdi (atfs) fight? Will he only kill those who fight him, or will he also kill all who disbelieve in him? If someone at the time wants to remain a non-Muslim and is not aggressive, will Imam Mahdi allow him to remain so?
Imam Al-Mahdi (AS) will not fight but only against those enemies who insist on fighting him. Non Muslims will never be forced to become Muslims. The Prophet Muhammad (SAWA) and Imam Ali (AS) never forced any non Muslim to become a Muslim. Imam Al-Mahdi (AS) will be applying Islamic rules in the same prophetic way.
Wassalam.