'We are the conscience of the nation,'' said Abdel Moety Bayoumi, a member of Al Azhar Research Committee, a state-sanctioned body that issues religious opinions and is often behind decisions over which books should be stripped from store shelves and banned. In Egypt, and other Muslim countries, where laws must abide by the Koran, fatwas by government-appointed officials can have the weight of law. ''We have to be clear what is at stake here,'' said Egypt's grand mufti, Sheik Ali Gomaa, in a recent speech in London. ''When each and every person's unqualified opinion is considered a fatwa, we have lost a tool that is of the utmost importance to rein in extremism and preserve the flexibility and balance of Islamic law.''