Taquiyyeh (taquiyya) is the Muslim doctrine that allows Muslims to lie or deceive about their religious beliefs when under pressure, as long as they believe it is for the greater good of Islam. In a nutshell, it means that “Muslims are permitted to lie to non-Muslims if the lie furthers the cause of Islam.” It has been defined as the Islamic practice of “concealing or disguising one’s beliefs, convictions, ideas, feelings, opinions, and/or strategies at a time of eminent danger, whether now or later in time, to save oneself from physical and/or mental injury.”
Origin in the Koran
The concept of Taquiyyeh is based on a phrase in Sura 16:106 in the Koran: “Anyone who, after accepting the faith in Allah, utters unbelief,—except under compulsion, his heart remaining firm in Faith—but such as open their breast to unbelief, on them is wrath from Allah, and theirs will be a dreadful penalty.”
Modern examples of taquiyyeh
One example of taquiyyeh was Yasser Arafat, who gave peaceful, moderate messages in English to Western audience, while at the same time advocating Islamic conquest in Arabic to Muslims. Another is Daniel Boyd, an American terrorist who never let his Christian neighbors suspect that he was a terrorist recruiting agent. According to terrorism expert Brigitte Gabriel, the Muslim Brotherhood goals include “intentionally feeding misinformation to our school children” under shelter of taquiyya.
Conflict with Judeo-Christian Values
The practice of Taquiyyeh means that those who accept at face value what Islamists say, as we are prone to do in societies based on Judeo-Christian values that honor truth-telling, they will be deceived. 
- Onward Muslim Soldiers by Robert Spencer, Regnery, 2003, p. 270.
- The Terrorist Next Door by Erick Stakelbeck,Regnery Publishers, 2011, p. 27.
- ””Al-Taquiyya: The Islamist Terrorist Weapon of Deception by Frank Salvo, The American Daily, November 11, 2007.
- Stakelbeck, p. 27
- Stakelbeck, p. 82
- Gabriel, p. 92.
- They Must Be Stopped by Brigitte Gabriel,St. Martin’s Press, NY, 2008, p. 77