Actually it's certainly not personal for me - my local schools aren't sectarian. My interest in this is 'pure' if you like!
No, nobody's denied an education, but if certain companies refused to employ Catholics and others refused to employ Protestants you can say that nobody was being denied employment, but it would still be wrong, don't you think?
I've said it before, but...If you think it is wrong that someone would be turned down for a job in the Civil Service or NHS solely on the grounds of their religion or lack of it, then you must surely understand that it is wrong to turn children away from schools on the same grounds. You surely cannot morally or logically disagree with the former yet approve of the latter.
But I give up. I suspect lots of people would think it is wrong for a company to have a deliberate policy of not employing Jews, but they won't say so.