Sounds like a "skill issue" Have they considered why they might be having trouble getting people to want to say they are Christian?
If this happens in the US the right will flip and flail and blame immigrants even though immigrants have been increasing that number if anything (more likely to be religious and Christian)
Heck US right wingers will throw a tantrum because this is happening in the UK because they have this creepy way of looking at the world fueled by paranoid racism.