They seem to be pushing the letter writing ministry in England these days, at the publishers own expense. At first they feared the data protection junk mail laws might prohibit it, but they had a re think. To me it seems a most boring way to count time. It is all about keeping the dubs involved in thinking about ministry and not going cold in lockdown.
What to say in reply? ....put it how you like but I would avoid contentious issues that show you to be “apostate “. The rank and file dubs don’t know about them anyway. I would ask seemingly interested questions that would make the writer look into some areas of faith that are thinly supported......if you want to.....