That's not true; see the above links for an in-depth analysis from Muslim scholars and classical jurists and exegetes.
Well, this is what the
Islam-QA website says on the matter:
The punishment for apostasy (riddah) is well-known in Islaamic Sharee’ah. The one who leaves Islaam will be asked to repent by the Sharee’ah judge in an Islaamic country; if he does not repent and come back to the true religion, he will be killed as a kaafir and apostate, because of the command of the Prophet
Isn't this exactly what you said in the 'Islam vs. Apostasy' thread? Namely, that in an Islamic state, if someone openly professes to have left Islam he will be asked to repent and if he does not he will have to be punished? After all, it would constitute treason?
Even if this is not what you said. Clearly many Muslims appear to think putting an apostate to death is allowed. As an outsider understand that I do not believe that there is 'just one Islam'. To me it is clear there are many different interpretations, some more liberal than others. I cannot ignore for example the Muslims who believe apostates deserve to be put to death.
Therefor, I stand by my point. If the UK would practise what Fishman preaches, he would have to be punished for apostasy. Maybe not by death, but that is only because he is a minor.