I hope you are a communist, because you seem to be labouring under the assumption that democracy ensures freedom of choice for all individuals when it actually enforces the choices of the majority. Which is all well and good when the individuals choice aligned with the majority but when it doesn’t you quickly find your options are limited.
Setting aside any moral/ethical arguments, and view it practically. Muslims strictly must eat halal meat, as is their choice. There are now enough Muslims in this country to warrant the industrial production of halal meat. A majority of people, as reflected in the views on this thread, based of the information available to them, have made the choice to be fine with eating this too. Therefore capitalist democracy has provided a solution to this market landscape. Those who are not fine with this have found themselves in a minority, and are now faced with a lack of choice. Everybody is expressing their choices and this outcome is the aggregate of that. Nobody’s really forcing anyone to do anything, it’s society working in response to people’s choices.
So in answer to your question, we do respect the Muslims right to eat halal, and the non Muslims right not to, it’s just the latter is outweighed by the former plus the people who aren’t Muslim but don’t mind eating it. Muslims have Allah, Christians have God (both the same guy I understand) for the rest of us free market capitalism is god. Freedom of choice is limited by what the market offers, what makes profit. There’s no more to it than that, bringing in ethics, morals and respect is just woolly headed nonsense. I mean people are free to eat roadkill if they want but you won’t find it in Sainsbury’s.
It’s a symptom of the demographic shift in the UK, which you may or may not be happy about.
And if the majority cared about ethics morals and respect, Muslims included, we wouldn’t be killing animals in the ways described in the first place, as multiple pps have pointed out.