No compulsion in religion.

With which sword was Islam spread? Even if Muslims had it they could not use it to spread Islam because the Qur’an says in the following verse:

“Let there be no compulsion in religion,Truth stands out clear from error” [Al-Qur’an 2:256]

It is the sword of intellect. The sword that conquers the hearts and minds of people. The Qur’an says in Surah Nahl, chapter 16 verse 125:

“Invite (all) to the way of thy Lord with wisdom and beautiful preaching; and argue with them in ways that are best and most gracious.” [Al-Qur’an 16:125]