Certainly not misguided or irrelevant.
I'd have thought the reaction from CofE members and officials, who are reported as saying it makes the CofE out to be a 'laughing stock', suggests that misguided and irrelevant is perhaps being kinder than the CofE deserves.
The C of E is simply reminding Christians of the guidance and teachings contained in the Christian bible, which is totally relevant for people who choose to follow Christ.
Then surely a newsletter to their members, and perhaps an article on their website, would be sufficient reach their target audience. Instead all they have achieved is confirmation that they are indeed misguided and irrelevant - I reckon that score of 0 out of 10 on the 'how to encourage young people to join' scale would be excessive
It would only be irrelevant to those who have chosen to reject the teachings and guidance of the Christian bible.
Don't be silly - one can consider the position advanced by the CofE as being misguided and irrelevant without any reference to their club rules and manual. If the Institute of Telephone Sanitisers* pronounced that they considered the eating of chocolate on Tuesdays to be bad form we can dismiss their view as being misguided and irrelevant without reference to their 'How to Sanitise Telephones' pamphlet.
* borrowed from Douglas Adams.