Swami Vivekananda while appreciated the the best part of Islam, and exhorted to the non-Muslims to adopt that, he was also ruthless in condemning the barbaric, divisive and inhumane aspects and actions of Islam and its followere, he did not mince words when he stated: "The Mohammedan religion allows Mohamme- dans to kill all who are not of their religion. It is clearly stated in Koran, "Kill the infidels if they do not become Mohammedans". They must be put to fire and sword. (II.335). Think of the little sects, born within a few hundred years out of fallible human brains, making this arrogant claim of knowledge of the whole of God's infinite truth! Think of the arrogance of it! If it shows any- thing, it is this how vain human beings are. And it is no wonder that such claims have always failed, and , by the mercy of the Lord, are always destined to fail. In this line the Mohammedans were the best off; every step forward was made with the sward - the Koran in the one hand and the sward in the other: "Take the Koran, or you must die; there is no alternative!". You know from history how phenomenal was their success; for six hundred years nothing could resist them, and then there came a time when they had to cry halt. So will it be with other religions if they follow the same methods." (II:369-70)
"Wave after wave of barbarian conquest has rolled over this devoted land of ours. "Allah Ho Akbar!" has rent the skies for hundreds of years, and no Hindu knew what moment would