I'm not suggesting people should be forced to observe religion but as a Christian country I don't think we should be looking to make Sunday more and more like a normal working day, not just from a religious point of view but because it used to be a day people could relax and it is becoming less and less like this.
Well for one, I'm not convinced we are a "Christian country" in anything but name at this point. We have some cultural associations with Christianity, obviously, but many of those are tenuous (how many people are actually celebrating the birth of Christ on Christmas Day?) or artefacts of history (the Head of State also being the Head of Church). Statistically the majority of British people have no religion or worship a faith other than Christianity. It might be the most popular of religions amongst those who do worship but it is not a popular pursuit in the population at large.
Again, as for relaxing, who are you to decide what people do or do not do to relax? Someone people enjoy shopping and find that relaxing, some people enjoy spending time with family, some people enjoy doing sport or going out with friends to the pub or restaurant. I enjoy actually going for walk on Sunday morning, having a roast in the afternoon and then reading, watching Netflix or playing video games on Sunday afternoon/evening. But what I enjoy should have no baring what someone else can or cannot do with their Sunday.
We should not be heading towards a more secular society, rather we should be taking steps to return to our Christian routes; individuals should be left to make their own choice, but as a country we should be taking steps to promote worship rather than diminish it - and setting Sunday aside may help with this.
Why should we be promoting religion on a state level? It's no business of the state whether you, I or anyone else are religious. I wouldn't want you to be prevented from worshiping in the manner of your choosing but equally you have no right to impinge on my ability to have nothing to do with organised religion. Plus once the state decides to encourage people to worship it will soon become harder for individuals to resist the insidiousness of that approach. But I guess that's what's really at play here. Christianity has lost the argument in the market place of ideas so the only chance now is to force the issue by trying to use the power of the state to enforce Christian dogma on those that have rejected it.
Also why should we return to worshiping God specifically? How is he any better than Allah? Or Odin? or Ra? Or any other god? Why does it need to be Christianity specifically? If people wish to explore their faith, worship a specific deity that is of course their right. I don't see that it is any business of mine, yours or the states to decide what religion their follow.
Well in my opinion I don't feel shopping is especially beneficial for people's well being - people may want to go shopping but it can often be stressful. The things I've listed above on the other hand I think are more beneficial for people's mental health.
I'm not sure why your opinion is more valid than anyone else's. Especially to the point that we should use the state to enforce what private individuals and business can do on Sundays. You might think that shopping is stressful (why the obsession with shopping?) but lots of people clearly enjoy it and I don't see why they should be prevented from enjoying that just because you'd prefer them to be in church.
One of the commandments is to 'keep the Sabbath day holy' and it is normally obligatory in the Catholic Church to attend Mass every Sunday (aside from the last 2 years because of the pandemic). Faith and worship shouldn't be restricted to Sunday no, but Sunday is still a day of celebration in the church and one which shouldn't be diminished.
And if someone was arguing that church worship should be banned on Sunday's I'd quite agree. But as no-one is proposing that you are still perfectly able to enjoy your religious worship on Sunday just as you always have. Just as I'm able to enjoy undertaking the activities I enjoy on Sunday (not shopping actually but that's by the by).