Will be taking a close look at the figures behind this.

London more religious than rest of Britain, report finds https://www.theguardian.com/world/2020/jun/24/london-more-religious-than-rest-britain-report-finds

Data tables are here:

https://www.theosthinktank.co.uk/cmsfiles/Theos-Religious-London-Research_GB-ex-London_tables-final.pdf

https://www.theosthinktank.co.uk/cmsfiles/Theos-Religious-London-Research_London_tables-final.pdf

Many of the questions explicitly include ‘if at all’ or ‘if any’.
e.g. "On average how often, if at all, do you pray?”

But not this one: "Which of the following religious groups do you consider yourself to be a member of?"

Londoners are less likely to identify as Christian.

40% compared to 46% outside London.

The guardian article says "Christian Londoners help their neighbours more than their non-religious counterparts”.

The difference appears to be 6% (with a 5% margin for error).

However, a much more significant determining factor seems to be age. 16% difference across the range. (still 5% margin of error)

...And you guessed it, older people are much more likely to identify as Christian than younger people.
(The view that people become more religious as they get older is not well founded.)
Find an admirable trait that older people tend to hold - and claim it for your faith.