LONDON — Half of British Muslims say being gay “should be outlawed.” Thus ran the headline in London’s Sunday Times this week. Even more opposed gay marriage, while almost half thought it was unacceptable for a gay or lesbian to teach their children.

These findings from an ICM poll will be presented in a Channel 4 documentary, What British Muslims Really Think, airing this Wednesday. The show will portray the growing divergence between mainstream Britain and its Muslim communities.

Poll after poll of British Muslims has revealed statistically significant levels of illiberal opinion. Polling methodology and data may contain errors, as some critics note, but this is only scientifically rectified by more data, not by defensive posturing. A 2009 poll by Gallup found that 0 percent of Britain’s Muslims believed homosexual acts to be morally acceptable. What previous polls have shown us time and again is more of the same. This latest ICM poll asked a slightly different question, about whether homosexual acts should be legal rather than viewed as morally acceptable. Despite half saying no, this time 18 percent did say being gay should remain legal. Progress? Well, if our baseline was zero, there could only ever be progress.