It depends whether you think secularism is a religion. Do I want yet-to-be-born sproglet to go to a school where the only legitimate form of religion sanctioned is secularism, when others are forced out. Do i want "there is no God" to be the religion forced upon them? Not really. But neither do I want them to hear that Jesus=Allah=Buddah=whatever... I'd love my children to grow up hearing the truth all over the place, so I don't like the current multi-faith system in schools.
But i do think that Christian (mostly anglican) schools were set-up to provide education for all, especially those who are sruggling. Christain schools should be serving their communities, taking in the poorest, the socially deprived, the failing, the expelled, and not selecting on the grounds of faith.
I think it's also worth remembering that the USA has a constitution which states that religion must be separate from school. The UK has always based itself on Jesus/The Bible's teaching (though these are currently undermined). What I mean is that the UK might not be in the position it's in now if it hadn't previously been an officially christian country. It is worth thinking about whether it is right to be a secular nation.
In answer to the question: i do think religious schools should receive state funding, and be allowed to teach what they like, as long as they select the weak and the poor and not the rich and the strong, as they do now.
Thanks for this post!