I would be furious too, I remember my mum not allowing RE classes in primary school due to the way in which it was taught strictly a Christian view on everything.
I then went to a catholic all girls high school (my choice) however opted out of catholic RE classes for 'world wide RE' where we about all sorts of belief systems and cultures including Buddhism, Muslims, orthodox, Mormons, brethrens etc. I thoroughly enjoyed it. However at 7 I wouldn't have been able to understand it. Nor would I have understood why my parents were supposed to go to hell for having me out of wedlock like the primary school RE teacher suggested. I think in public schools if should be banned!