As many folks know, Islam teaches that it is permissible to lie in order to avoid persecution. The link above is to an extended discussion on the subject, which is know as al-Taqiyya, which roughly translates as "dissimulation." Excerpt:
The word "al-Taqiyya" literally means: "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." A one-word translation would be "Dissimulation."