Its an interesting point I guess, but surely its perfectly acceptable to question the validity of ALL religious beliefs.  Criticising one at the expense of another seems like a pot/kettle/black situation to me. 

So I could (rightly in my view) get into trouble for trying to persuade people to attack muslims, but should be able to get away with suggesting that Christianity and Islam are equally infantile.

Anyway, That's for another thread I reckon.