Ice cream ad offensive to Catholics

This seems a trivial story but it isn’t. The Advertising Standards Agency has banned an advert for a brand of Ice Cream because it

"was likely to cause serious offence to readers, particularly those who practised the Roman Catholic faith"

The image is of a pregnant nun, eating ice cream with the strap line “Immaculately Conceived”.
The company, Antonio Frederici is trying to make a point with this advert, saying they want to

"comment on and question, using satire and gentle humour, the relevance and hypocrisy of religion and the attitudes of the church to social issues"

and they have plans to post follow up adverts on a similar theme close to Westminster Cathedral.
How many times does it have to be said? People have no right in our society not to be offended. Religion is fair game for mockery and satire and to do so has long been a tradition in this country. Where would British comedy have been without Dave Allen, Father Ted or Monty Python? All of these shows attracted criticism but quite rightly were never banned. You would after all think that an almighty God could defend himself without the help of the ASA, but the point is they should not be making this kind of judgment.
If an advert is promoting prejudice or anti-social behaviour or glamorising violence, or if an advert is making false claims for a product then that is the point at which the ASA should get a say. It should not be using its powers in the suppression of free speech.