I don't believe in any religious things because other than as stories that may or may not be partially true.
I do believe in scientific fact and I respect the idea of behaving towards others in the way that i would like them to treat me as well as trying to do more good deeds than bad deeds.
Because of the way i feel, Christmas is not a big thing for me. I feel that I am being a hypocrite by celebrating it so I see my parents on the actual day and give a few cards to people I know but I write something personal in them.
When my son was little, I did the whole Father Christmas thing but he spends most of the time out with his friends.
I do believe that schools should talk about religion and I think that you should be pleased that your son is taking such a interest.
Rather than withdraw him from RE lessons why don't you talk to your child's tszcher abouf ghd school's RE policy.
I seriously doubt that he was told the Christmas story as fact. A six year girl who I help with maths and other homework often tells me the most outrageous things that her teacher had supposedly said but I did speak to her teachers I collected her and found out that the girl had not told me everything that had happened.
Also are you planning on celebrating Christmas at home at all?