You are totally justified, look at the outcry there has been over the last few months in schools regarding the headscarfs.
I went to a R.C school but I am not catholic.
I chose to take part in the services but not the religious side of things and was never forced into it.
This "teacher" was out of line forcing her/his beliefs onto a child who is entering the age where they are able to decide what they do and do not believe in.
I would speak to the head and kick up as big as fuss as possible or this will only occur in other schools if this is a supply teacher.
I honestly believe that in mixed culture schools that the assemblies etc should be more relaxed and open and the R.E an optional subject for all ages.  
      Hi
Can you just clariffy (maybe you have and i have missed it) what you mean by "segregated", what did the teacher do  to your son?Give me the details and ill comment as an atheist, a parent and an ex teacher at 3 roman catholic schools.
Seconsly, why do you specificaly mention "violece towards women" rather than violence in general?  
      It is hard to comment  without all the facts, eg  if your son was not taking part in that activity, could his behaviour constitute this  repremand because of  disturbing  those pupils engaged in that activity by say talking, messing about etc ?  
      De. Sade, the school should have a policy regarding collective worship and you should be able to see it. If they haven't, they need to have ready a very good explanation. As a parent, you can ask that your child does not take part in collective worship but if you haven't specifically said that, then your son will be expected to 'toe the line', as it were. 
I have seen teachers try to make children adopt the 'pose' for praying, with and without success. They usually make themselves look daft. I don't, and never would, make any child 'pray' if he/she doesn't want to; I don't do it, so how can I make them do it?
If you've asked for him not to join in collective worship then he should be allowed to stay out of the room. He shouldn't be penalised for it though. The supply teacher may not have been acting in a manner sympathetic with the school policy and the school needs to take up this matter with the agency which sent him/her. At the very least, that teacher should be appraised of how to deal with this in future and I'd insist on an apology if I were you.
Sorry to hear about your son's treatment and I wish him well for his SATs (I hate them too).  
      my personal opinion is that religious education should be left to the parents / guardians of the child/ren. and in no circumstances should a child made made to feel inferior or wrong for having a different belief to his/her peers (or non-belief) I would have gone balistic too de-sade.
:love:  
      It would suggest from your information so far, that other pupils of other faiths were allowed to remain in that room?  
      Peenut he said that in his first post on the thread.  
      You know, I would send my son to school tommorow with a letter of "apology" adressed to that teacher," We  forgive you teacher, for you do not know what you do "... now didn't sombody  else say that ? .......(luke 23:34.)  
      Losing a job over this is way to harsh and any employer who took things that far would be in for a bad time at an industrial tribunal. Nor is their any need to publically shame the teacher (not that it would be an acceptable thing to do under employment law anyway) as it is a private matter between the teacher, the headteacher, the parent and the child.
So saying, De Sade, you reacted in all the right ways as far as I see it. Do take it up with the school and get a decent apology. However, for your son's future benefit it might also be worth having a talk to him about the benfits of keeping his head down and not rocking the boat in all situations. For instance, he might well find himself visiting a friend's home, or perhaps travelling abroad, where he would be expected to go along with someone's religious practices simply out of courtesy. I went to schools that pushed the prayer angle on occassion so I tended to just adopt the position and think about anything other than prayers. Easy option, but there was nothing to be gained by standing up for my agnostic beliefs either. But non-denominational schools are not the place for pushing any kind or religion as far as I am concerned.
H  
      This thread is exactly why I can't stand Christian Fundamentalists. I don't know if that teacher was one or not, but imposing your own views on children and singling them out because they don't agree or follow that is very wrong. 
They shouldn't be sacked as some suggest, but taught tolerance like others have suggested. I'm completely behind you in agreeing that you should kick up a fuss about it, but if it was old news then is it best to drag it up again?  
      To be perfectly honest i'm unsure as to why you have this up as a post.  You have decided already to kick up a fuss about it, and really we are serving no other purpose than to flame your fire.
I'm not saying that your fire should or shouldn't be flaming.  I'm not saying that you don't have the right to be angry.  All i'm suggesting is that perhaps without all of the facts no-one is in any position to really give a open view point.
Talk to the teacher.  Air your views in a calm manner and see what the response is.  You'll know what actually happened, you'll feel it, and how the whole scenario came about.  Only then will you ACTUALLY BE in a position to know of your next steps, or course of action, which might also be, that you meet with the teacher and discuss it, and no further action is either deemed necessary or appropriate.
All i'm really saying is that, you are incredibly upset and angry at the moment without being in a position of knowing all of the facts for yourself.  It might be that when you have the facts that you will be angry, but i can't see how it serves of any value to anyone, least of all yourself, to be emotionally charged without the full script.
I'm not trying to be argumentative, nor am i trying to upset anyone, nor am i belittling the whole episode, i'm just trying to give another perspective.
Lots of love, hugs and kisses
Little 
XXX  
      Get the child to try this it worked for me in a similar situation years ago. 
Just say I'm sorry but i'm not allowed to associate with cults, & when they say as they will that christianity isn't a cult just tell them to look it up in the dictionary
I found it very successful  
      Personally I don't have anytime for religion,but I do respect those that do and as long as they don't try and ram their views down my thoat then live and let live.  
      Im a bit late replying but..................................................
I agree wit you that the incident should not have happened,  and that your child should have been dealt with in a different manner. Personally i would never insist that a  child prays (in fact i would never lead pryers in school, but that is a different story) and certainly sending him out of class is very harsh.
However, i think the teacher in question probably so it as a control issue. Supply teachers are often  given a very hard time by pupils who try to undermine their control. The teacher probably felt that if s/he didnt establish who was in control at this stage they would have lost it forever with that particular classand maybee the whold school. Through in his/her own religious views and it was a receipe fo dissaster.
So, yes its a good idea to go and she the head privately and insist that this does not happen if your son is genuine and adameant that he does not believe in parying you might feel able to support him by putting in writting to the school your wish that he does not take part in religious indoctrination (ooohhhpppsss sorry i mean religious worship)?