This was not the position a few years ago though when a common trend people would attend church for the school place. Are you describing a common trend?
I don't think it has been the case in a general sense for a long while.
The problem with the stories in the media about people pretending to be religious to get into a faith school is that they are death by anecdote and also largely used to promulgate an editorial line - pro-faith school.
You can trade anecdotes about individual schools till the cows come home. The school where I'm a trustee is the most oversubscribed in the area and I'm well aware of the steps people take (usually within the rules, occasionally outside them) to try to secure a place. But that really only tells you about my school, not nono-faith schools generally.
If you want to know about the totality, not just the cherry picked anecdote, you need to do what I have done - look at the actual evidence in the form of numbers of applications per place for faith schools overall, and non-faith schools overall. It isn't easy to actually get these data countrywide, but where you can get data they all point to it being non-faith schools that are the ones that parents are keenest (as a category) to get their kids into.
So I've shared my data - there was also reports from London about oversubscribed schools, which had to have separate tables for faith and non faith schools, as no faith schools came close to being near the top in terms of oversubscription.
And of course it makes perfect sense - in a country where perhaps 10% have any meaningful involvement with organised religion, why would you expect that population to support nigh on 30% of school places within faith schools run by those very religious organisations.