Disparaging Islam, Mohammed, or Allah, is already a criminal offense in most of Europe and in Britain in particular.
Everything you do online is monitored, and if somebody simply 'perceives' anything you say to be disparaging, they can report you and you can be arrested and jailed.
Although there are rare cases of antisemitism, and anti-Christian thoughts being persecuted, this is not the norm. The focus is stopping any kind of anti-Islam thought of any kind. And 'truth' has no bearing. Even if you are just stating a simply known fact, such as Islam is heavily involved in pedophilia, and Islamic men believe it is their religious 'right' to rape Infidel women, you can still be arrested.
George Orwell said, In a time of universal deceit, telling the truth is a revolutionary act.