Picking up on Aloha and M2T's points about discrimination - apparently in the West of Scotland, such discrimination DOES still occur - not legally of course. To find out what religion you are, you will be asked what school you went to. If the name of the secondary school is not immediately "obvious", then you will be asked what primary school (and the catholic ones are always St. something or other).
When I moved back to Scotland 10 years ago, I didn't believe my (now) dh when he told me that this sort of thing went on. But I now realise that it does - less than before, but it does still exist.
I'd been brought up by my parents to be "blind" to any of this sort of thing. Coming from South Africa, they knew the extremes of discrimination - and the ugliness that that could lead to. I was 29 before I realised that you could tell if someone was (likely to be) Jewish by their name and/or looks!
I'd like my ds to be similarly "blind" - which is partly why I am wary of him going to a Catholic primary school, as he might then suffer from some of that discrimination himself.