This is not true. Referring to certain verses of the Quran, there are some who attempt to give the impression that Islam is a religion of war and violence. This is totally untrue. Such verses relate to a specific situation and are meant in a restricted sense; they are not of general applicability. Observe the following verse:

And fight in God’s cause against those who wage war against you, but do not commit aggression—for surely God does not love aggressors. Slay them wherever you find them [those who fight against you]. (Quran 2:190-91)

Fight them until there is no more fitna [religious persecution] and religion belongs to God alone. If the desist, then let there be no hostility, except towards aggressors. (Quran 2:193)

The above verses do not convey the general command of Islam. The truth of the matter is that the Quran was not revealed in the complete form in which it exists today. It was revealed from time to time, according to the circumstances, over a period of 23 years. If this is divided into years of war and peace, the period of peace amounts to 20 years, while that of war amounts only to 3 years. The revelations during these 20 peaceful years consisted of the peaceful teachings of Islam as are conveyed in the verses regarding the realization of God, worship, morality, piety, justice, etc.

In 13 years of Makkan period, the Prophet completely avoided conflict and killing. And migration to Madina, after giving up the native land, was also a kind of avoiding violence and that was super avoidance of violence. When the Prophet of Islam emigrated from Makkah to Madinah, his opponents became aggressive towards him. But the Prophet always averted their attacks by the exercise of patience and the strategy of avoidance. However, on certain occasions no other options existed, save that of retaliation. Therefore, he had to engage in defensive battle on certain occasions. It was these circumstances which occasioned the revelations relating to war. These commands, being specific to certain circumstances, had no general application. They were not meant to be valid for all time to come. That is why the permanent status of the Prophet has been termed: ‘a mercy to all mankind’. (Quran 21:107)

In principle, the Quran teaches peace and complete freedom of thought and religion, and does not, to any extent, advocate for the killing of people due to differences of ideology.

Source: The Seeker’s Guide