"It is 'open season' for attacks on Christianity these days, both on AnswerBank, and also the media, but if anyone dares to attack Islam's stances on homosexuality, and female freedom, they are criticised for doing so."
This certainly isn't the case on the Answerbank. And even if it were, being criticised is nothing to be scared of - so what if people criticise you? If your beliefs stand up to argument, that shouldn't be a problem.
As for society at large, yes it's true that criticism of Islam is sometimes controversial. Personally, I don't feel it should be, but again I see no reason to fear controversy. The works of Sam Harris and Christopher Hitchens -to give two examples of writers heavily critical of Islam - consistently do very well in the UK. As are several newspapers.