That's a more subtle opinion (or is it a fact?) than I expected from you, Tony. But still very muddled and nebulous.
Boiling that down:
1. It's not wrong to offend a faith. (I agree)
2. It is wrong to deliberately set out to offend a faith sometimes. For example, it's OK to offend Catholics on the subject of child molesting.
Is it OK to offend Muslims re child molestation?
Is it OK for comedians to make fun of a faith or some aspects of it?
These things are difficult... I'd say, on balance, that it's wrong to be willfully unkind to others with no other objective than being unkind. Be it to a faith or anything else. It's all about intent and the spirit in which things are said and done. But it ends there - nobody can or should arbitrate what is fine and what isn't. One could argue, for example, that fundamentalist Islam as practised by some is an abhorrent; medieval and hateful ideology and that taking the piss out of it is the very best way to reform the people engaged in it.