OP I would be calling the school now and telling them you are p!ssed. You never gave them permission and they ignored you. That means they are at fault.
I haven't read any of the posts, just the original OP. So not sure after 19 pages where this discussion is at.
All I'll say is I was forced to attend RE classes and in my school they 100% BRAIN WASHED kids into believing their bu!!sh!t religion. Thank goodness I grew up and was able to see what my school was doing. It is terrible to push a belief onto a kid who isn't equiped with all beliefs in order to choose which one (if any) suits them. That is brain washing. Sorry but it is and it is unacceptable.