Holy Prophet Muhammad (Sm) Said : "The Muslim who mixes with the people and bears patiently their hurtful words, is better than one who does not mix with people and does not show patience under their abuse."
(Mishkat, Book:ch. 'Gentleness, modesty and good behaviour')

The Holy Quran tells Muslims:

1. "You will certainly hear much abuse from the followers of previous books and from the idol-worshipping people. And if you are patient and keep your duty -- this is surely a matter of great resolution." (3:185)
2."Many of the followers of previous books wish that they could turn you back into disbelievers after you have believed, but you should pardon and forgive." (2:109)

The Holy Quran tells Muslims:

"When you hear Allah's messages disbelieved in and mocked at, sit not with them until they enter into some other discourse." (4:140; see also 6:68).

These verses deal with the case when the religion is being mocked and derided (as distinct from being criticised). A Muslim is required to do no more than to withdraw from such a company, and even that only while the mocking continues, and to actually rejoin the same company when they have changed the subject! How far from ordering Muslims to kill such people!

Some Jews, when addressing Muslims, would distort the greeting as-salamu alaikum and say it as as-samu alaikum, which means "death be upon you". When they once addressed the Holy Prophet in this manner, his wife Aisha retorted back in the same words. The Holy Prophet disapproved of this reply and said that God did not like harsh words.