Islamism is a political ideology based around structuring a society and its governance on Islamic principles. Islam is a religion. Muslims are people. I find that easy to differentiate. We are a secular democracy in which live many people of different faiths and none, all of whom are equal under the law. There is no room for Islamism here.
I'd happily get rid of all the faith schools, and not especially because of the Islamic ones. I think that might be easier said than done, though, and I think the real religious fundies of whatever creed will just home educate, which might actually make matters worse. I'd also be happy to lose homeschooling, but that would be highly contentious.
Not sure that these, nor any of the other points, would address John's concerns about the nature of neighbourhoods changing with demographic change.