I think that the cultural aspects of Christianity have a privilege in this country, because this country has a Christian tradition and most people in the UK are culturally Christian.
As most people are culturally Christian, but not religious, that means that Christianity has a higher profile. This sometimes works in the favour of religious Christian people - the non-religious people around them are far more likely to celebrate Christmas than Eid, to accept a carol concert in their school, a nativity play in their school, a Christmas tree in their place of work, to visit and financially support churches for heritage reasons, to have knowledge of the parables and of religious art.
But is also works the other way. Because most non-religious people are culturally Christian, we are also likely to use Christian blasphemy like Christ on a bike or bloody hell, to mock areas of Christianity, to dress up as nuns and priests for a hen night, to tie someone as a cross as a joke as students, to roll our eyes at people wearing sandwich boards saying 'the end of the world is nigh', to have gay disco nights with choir boys and angels.
Because Christians cannot have it both ways. The non-religious don't treat Christianity like we treat other religions, because while Christianity may be their religion, it is our shared Christian culture.
Religious Christian organisations press for Christianity to be a major part of public life, with far more visibility than other religions, so they cannot complain when we make it part of our public life in ways that we see fit. Behave like any other religion and maybe society will give you the same level of respect.