Not sure how you could realistically pull the plug but
1. Since Islam isn't a race but a faith, stopping immigration isn't the answer because not all immigrants are Muslims, and not all Muslims are immigrants. Add to that the issue doesn't appear to be a major concern for Muslims here from say Indonesia.
2. As much as it sucks, we're just a page in a history book. Given that Judaism and Christianity have had reformations in a way, it's likely that at some point Islam will go through some reformation too. I know some find it hard to believe, there are a diverse range of interpretations within Islam, many of which take a much more peaceful and tolerant stand. Of course these are minority groups (currently) and their outlook may well change if they gain power.
3. We take a less strict and harsher approach than China and put more emphasis on engagement with communities, with tougher punishments etc
1/ Strictly it is a race, the legal definition was updated several years ago and now a race is any member of a shared demographic.
Also the perpetrators of the Bali bombing say hi.
2/ if we're talking history just look at how many religions have been wiped from the face of the earth. Know any Ra worshippers?
3/ decades of engagement and platitudes have done nothing.