A similar thing happened to me sassy and i was so angry. I specifically denied permission for re but my daughter came home one day saying the teacher had said evolution is wrong etc. appalling.
I am very clear about it now, that I will make complaints / take legal action etc if necessary.
Previously I was not too fussed but to hear the absolute tripe this volunteer was 'teaching' shocked me to the core. I even made a speech at a p & c meeting (only one I've ever gone to lol).
It's very important to me now that my children aren't included in any religious education at all (unless it's anthropological slanted)