I agree that some of the best minds in the world are Asian and particularly from the sub-continent. I think my point is that whilst all the British kids are learning Islamic studies or songs in Urdu or black history, they are not learning English or maths.
Well I certainly agree with that.
Again, religious studies (of whatever brand) is something that, in my opinion, should be taught outside of school. Parents should be at liberty to teach their children whatever flavour of religion they prefer or, of course, no religion at all if they are enlightened atheists (oh, oh - Joe alert!), so long as they do it in their own time. You are quite correct that some muslim schools seem to concentrate on religious studies and reading the koran almost to the exclusion of anything else.
Schools, especially primary schools, should concentrate only on the basic essentials of English and maths. Other things can come later when those basic skills have been mastered. In fact, one could argue that trying to teach and learn subjects other than these basics would be severely limited if pupils do not already possess a certain level of understanding of English and maths.
