What I dislike about the criticism of Christianity in the UK firstly is that I find it very cowardly as, as others have pointed out, criticism of other faiths is seen as much more taboo.
But also because it focuses (deliberately I think) very much on the theology and ignores religion as community, sense of belonging, tradition and a moral framework for individuals and communities. "Hurr durr sky fairy nonsense" really isn't an adequate argument when sitting in a country that for 1400 years has been Christian and whose society, traditions and beliefs have been hugely shaped by that.
It also assumes when Christianity has gone away in the UK that void will be filled by something more enlightened, which I doubt.