And the mayor of your biggest city is a muslim.
So what? AFAIK, Sadiq Khan has been doing a superb job for a while now. You can never completely eliminate all the crimes when your population is close to ten million.

So you have literally surrendered to Islam. Quite aside from the rape rings that have been going on for DECADES. That sort of thing doesn't happen for that long with cops who are afraid to be called racists without some very high level people involved. Your supposed leaders are traitors and the people are idiots.
Your point ain't making much sense to me. Mayors are elected to make the overall infrastructure better, which includes the improvement of the system of transport, housing, policing, etc. If a Muslim mayor is able to handle all this in a good manner, why the hell should anything else (including religion) even matter?
Because it does. Religion is a part of any healthy culture. It bonds people, gives them a common identity, promotes social trust. A mayor of your capital with a hostile religion means the culture is breaking down.