I understand what you are saying but you would need a muslim majority population to have any hope of that happening. And even then there would be quite a few people who whilst muslim wouldn’t want to be living in a caliphate or have a much gentler interpretation of their religion than these nutters. Just like any religious group there will be different strains depending on country, culture, family tradition as well.
I do think it’s difficult being a normal muslim person in the UK. The reality is muslims in the news tend to be for not great things like terrorism, grooming gangs (another bunch convicted recently) hassling schools/teachers pressuring other convicts into converting, anti-semitic statements from Muslim politicians, the guy trying to run for mayor in Birmingham is a real peach, mainly defends drug dealers as a solicitor and thinks there is a zionist elite doing blah blah, over representation in prison.
Thats just off the top of my head from newspapers etc. people talk about the threat from the far right but the reason people don’t take it as seriously is because the far right a) don’t have that much reach and people are quite comfortable with telling them to fuck off b) haven’t killed that many people.
The problem is that none of that stuff is not true BUT it is not reflective of everyone. There are plenty of thoroughly decent people who happen to be muslim and I think it’s important to remember that.