I was under the impression (I'm happy to be disabused of the notion, but an albeit quick search seems to back it up) that Taqiya is a legitimisation of apostasy in extremis: basically speaking, lying about your beliefs if you need to do so in order to survive. Admittedly my knowledge of that is based on reading about Moriscos and Conversos during the Spanish Inquisition – I wondered if it had changed over time, but a cursory search seems to flag sources from either right-wing or extreme Islamist websites. (More evidence, should anyone need it, that both groups tend to agree on quite a lot). That said, I don't doubt for a minute that some - possibly many - Muslims feel maybe that they don't need to adhere to the truth quite so assiduously when dealing with non-Muslims. But then that’s a thing which I suspect is pretty common to any large group of people who feel tied to each other by mutual bonds of belief when dealing with others outside of that network. And, of course, the idea that a group lies to those outside is a begged question which if held by an individual is impossible to counteract, as that individual will counter that all the data available is based on falsehood. (Now, who else does that remind me of?) This means that one group can hide behind their distrust of another group safe in the knowledge that even if that other group convert hook line and sinker to their own mindset, then they are still ‘other’, because they are inherently dishonest. It's a paranoid's dream. 'Lying for the Lord' is a similar accusation of the practice of institutionalised dishonesty, this time aimed at Mormons. In reality it apparently has no basis in Mormon scripture - although it's pretty clear that some Mormons can and do lie quite spectacularly. Whether this is because they are, specifically, Mormons, or, more generally, human beings who feel themselves raised above the niceties of decent human transaction by dint of their supposed religious exaltation, is open to quite a lot of interpretation. But I strongly suspect it is by no means limited to just a couple of religious groups - or, indeed, specifically religious groups. By coincidence, I have recently finished reading Under the Banner of Heaven – the replacement of a few key words could make this a description from Karakauer's book describing the apparent predisposition to violence which has been an undercurrent in the history of Mormonism.