Oh I totally agree and the vast, vast majority will automatically and happily comply, so in most cases it will not even be an issue - no need to check.
The issue however is those that will not comply, for whatever reason, will probably not have the ties you talk about and may do so through subterfuge.
In reality, the greater worry is not religious services but people who decide to meet their friends and family because that’s more common.
Well, it depends.
While it may be more common for people to meet friends or family (I haven't met any of my friends and have only seen my mum, dad and gran since lockdown, apart from talking to our neighbours over the fence) they're hugely unlikely to be in a large group which would be attending a religious service.
Basically, neither are good.
I'm not religious, so I never go anyway. But perhaps if I was and I had more friends etc who were, then I'd see that more services are staying open. I'm just not aware of it - as I said, wasn't aware of anything like that until yesterday.
Only times I have seen groups together is when I've been out on my bike/run/walk and it has been few and far between, though obviously I know people are doing it.