Bid’a is innovation in Islamic doctrine or practice. It is considered a serious sin, since Islamic doctrine and practice is supposed to have been set entirely by Allah through Muhammad. This idea tends to discourage Islamic reform, including reform of the aspects of Islamic doctrine that call for warfare against and the subjugation of unbelievers. But this explanation of bid’a (bid’at in Turkish) from Serenity Fountain, a Turkish Sunni site, allows for the appearance of innovation, so as to deceive unbelievers. The particular text below is online here (thanks to Joel).
This is noteworthy because here again, an Islamic authority is saying what non-Muslims are charged with “Islamophobia” for saying: a Muslim can pretend to innovate in religion, appearing to stand for reform of the unpleasant or supremacist aspects of Islam, in order to fool credulous kuffar. On ABC’s “This Week” last Sunday, Ground Zero mosque spokeswoman Daisy Khan reacted with offended incredulity when 9/11 family member Peter Gadiel suggested that he wasn’t sure he could trust her soothing words of moderation — yet on the same show, “journalist” Christiane Amanpour would not allow me or others to give solid proof that Khan was lying, having denied on the show that the Islamic supremacist mega-mosque at Ground Zero would be a mosque at all, after having affirmed that it would be at a lower Manhattan Community Board meeting.
So was Daisy Khan deceiving unbelievers in the dar al-harb? Why is it illegitimate, in light of teaching like this, even to ask that question?
For your questions about Islamic knowledge:
06 October 2010 / 28 Shawwal 1431
KINDS OF BID’AT
There are three kinds of bid’at :
1-It is the worst bid’at to use -without any darurat (compulsion)– those things which the Shari’at  says to be the signs of disbelief. On page 467 of al-Bariqa and 696 of Majma al-anhur, it is written that the ‘ulama said, “It is permissible to use them to deceive (khud’a) the disbelievers in dar al-harb. ”
2-Those beliefs which disagree with what is communicated by the savants of the Ahl as-sunnat  are also evil bid’ats.
3-Those reforms made in the name of worship are bid’ats in worship and are grave sins. Some ulama divided the bid’ats in ibadat or amal (deed) into the hasana and sayyia. Al-Imam ar-Rabbani ‘rahmatullahi alaih’ did not say bid’ats about those bid’ats which scholars termed ‘hasana’. He called them ‘sunnat-i-hasana’. He said ‘bid’ats’ about those which they termed ‘bid’at-i-sayyia’, and he condemned such bid’ats. Wahhabis, on the other hand, say ‘sayyia’ about bid’ats termed ‘hasana’ and approved, and they call those who practice such bid’ats ‘disbelievers’, ‘polytheists’.
 bid’at: (pl. bida’) heresy; false, disliked belief or practice that did not exist in the four sources of Islam but which has been introduced later as an Islamic belief or ‘ibada in expectation of thawab (blessings) ; heresy.
 Shari’at: (pl. of Shari’a) i) rules and commandments as a whole of the religion. ii) religion.
 Ahl as-Sunna (wa’l-Jama’a): the true pious Muslims who follow as-Sahabat al-kiram. These are called Sunni Muslims. A Sunni Muslim adapts himself to one of the four Madhhabs. These madhhabs are Hanafi, Maliki, Shafi’i and Hanbali.