All that we know is what is true now. The links you posted make predictions based in hysteria. They repeatedly interchange terms like foreign-born, Muslim, and Sharia law to make the supposed threat that much more fantastic. And the sources are right up your alley, too, from overly conservative and paranoid sources. Look, I can find sources that make all sorts of amazing predictions on the net, and they will still be just predictions from debatable sources. What we do know is that Muslims make up a small fraction of the population in England and other Western countries (between 2 & 4%, in most cases). Likewise, the numbers of those who practice of Sharia law is a fraction of that, and of those, the ones who participate in violence is infinitesimally small.

You are just fear-mongering, plain and simple and it comes from a rather disturbing political position. You are just ignoring the facts and letting your paranoia dictate your judgment.