I don't think that's wrong - the big news in the article was just that C of E attendance was decreasing (at least relative to mosque attendance). Overall church attendance percentages have decreased over the last 100 years in the UK but I think the numbers have increased lately, just not in the C of E.
Daleel is confused - but we already knew that. He may well not understand about the different Christian denominations, which are admittedly confusing even for those who grew up in a Christian culture.