In practice it is a much more secular country than the USA.
And I doubt that Cameron is particularly religious; I doubt that he goes to church frequently, for example. I think this was a dog-whistle to two core groups of Tory voters: the anti-immigrant bigots, and the traditionalist, things-ain't-what-they-used-to-be brigade. With regard to the latter, there was never a time of Perfect Morality; people have always been complaining that things ain't what they used to be (and they never were!); and there was plenty of crime and immorality in the Good Old Days of Good Queen Victoria - just read Dickens, for example. But a number of people are full of the idea of there being a time when God was in His Heaven and the King/Queen on the Throne, people were Moral, and there's been a Breakdown in Society ever since we went all soft and secular. 20 years ago, such people tended to end up attributing all problems to the abolition of the death penalty; nowadays, they tend to attribute them all to our membership of the Europaean Union.
It's interesting, however, that these nostalgic Tory Christians never refer to the texts about how the rich finding it harder to get into heaven than a camel through a needle's eye, or the condemnation of those who reject immigrants ('I was a stranger and you took me not in...')
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