IN SEVERAL Quranic passages as well as the example of Mohammad, Muslims are encouraged to deceive non-Muslims when it will help protect Islam. It is known as the principle of “taqiyya” or “religious deception.”
This is less surprising if you first understand that in mainstream Islamic teachings, the world is divided into “the house of Islam” and “the house of war.” That is, part of the world is Islamic and the other part has yet to brought into the light with Allah’s holy law (Sharia).
And since relations with the non-Islamic part of the world exists in a state of war, then deceit is an appropriate strategy, used by all military commanders since the beginning of warfare.
As Raymond Ibrahim wrote, the Quranic verses 3:28 and 16:106, as well as Muhammad’s famous assertion, “War is deceit,” have all led to the formulation of a number of doctrines of “taqiyya.” And this is not an obscure point of theology. It is being practiced today by devout Muslims