DeletedUser
A "Christian country"? Unless you are talking about a dictatorship somewhere which I haven't heard of, no such thing exists. For a nation to be described as an [insert whichever religion here] country, it can only be a totalitarian state. Something I assume you aren't in favour of, right?
Just from a quick check at NationMaster the figures from the 2001 census...
Christian (Anglican, Roman Catholic, Presbyterian, Methodist) 71.6%
Muslim 2.7%
Hindu 1%
other 1.6%
unspecified or none 23.1%
And like most other developed nations, those census statistics are huge overestimates of who is actually a practicing Christian because UK church attendence is only 27% (and that covers all religions, not just Christianity.
Based simply on Church of England, the UK is what I would describe as a christian country, in the same way that Saudi Arabia would be a Muslim country, a simple definition based on the majority and in no way inferring that all residents must be of that religion.
Obviously there is a huge difference between someone choosing to wear a an item which symbolises something about their religion and someone whose religion dictates that the item must be worn. If a school says no jewellery, then no jewellery, whether it has religious significance to the wearer or not. It is no different from me not being allowed to wear a hat while Jewish guys in my class wore their kippah. No one is being discriminated against by the rule, but refusing to allow a Kara or a Kippah or a headscarf would essentially amount to the denial of an education on the basis of religion.
Interestingly according to this source the requirement is not to actually wear the bracelet but that the Kakars (of which the kara is one) are as follows. "The articles are to be kept on or with the person at all times." Therefore asking the person to remove the bracelet and put it a pocket would not mean that you are asking them to go against their religion. So then they should fall under the no jewellry rule as well.