Time will tell. Right now you’re correct, of course, but native birthrates in both countries call into question their long-term sovereignty.
96% of the UK is NOT Muslim, and Muslims have been here since the 50’s. As have Sikhs, Hindus, HK Chinese/Asians and of course black British.
92% of the UK is still white.
Muslim birthrates are expected to level out and then DROP between now and 2050, not rise. Most experts believe the % of Muslims in the UK will never come close to 10%, let alone this nonsense that the UK will be a majority Muslim country. The average I read from demographers is maybe 6%. Too many perhaps, but far from the 50+% some people in the US seem to believe.
The UK is not, PC stupidity aside, a dhimmi nation, a dhimmi people. Nor will it be. Nor is England/UK (not the same thing btw) London. Or even its big cities. Most of the UK is still native white-heavy, where Muslims and those of colour/ethnicity are few and far between. Contrary to US hype.
There is a reason a lot of the UK chat on FR gets me and other freepers either laughing or angry. A lot of Americans seem to believe the most ridiculous nonsense about the UK.
And when we UK and Irish freepers try and state that whilst we have serious issues with Islam and immigration, its far from the nightmare scenario, we get called naïve or deniers. Ironically by people 3000 miles away from the country we actually live in.