"Forcing all children to attend secular school unless parents wish and are able to pay school fees is rather totalitarian, however..."
Er, no it isn't. Preventing people from adhering to a religion at all would be totalitarian. Providing secular education for all and allowing anyone to worship/teach their children about their religion in the privacy of their own home, outside of school, is definitely not totalitarian.
As I said, the issue as to whether faith schools are acceptable at all is one thing. Allowing them to select pupils is another one altogether. If they get 10% funding from the church, why are they allowed to select pupils to fill 100% of places if they so wish. It doesn't make any sense.
It is unfair that some people have easier access to 30% more taxpayer-funded primary schools than others just because they go to church. It is an arbitrary discrimination.
It's not enough to say that Catholics pay tax too. They do pay tax, but they get more schools to choose from in return - they are not barred from secular schools. That is unfair.