These left-wing members of the middle-class are still rebelling against a Western imperialism which only existed many, many years ago. And that imperialism was led by white people who weren’t that unlike their own parents, grandparents, etc. Thus they must embrace the Brown Exotic and any other exotics who demand and want (or who are offended or insulted).
Other exotics, of course, aren't as loud as Muslims. Thus Muslims get the most ear-time. They also have all the ideological/theoretical work (which is needed to defend the indefensible) done by white graduates either long out of university, just out of university, or in university. In the aforesaid universities, these white middle-class Leftists will have been taught about how uniquely evil the West is. How uniquely evil the British Empire was. They'd also have been taught this by middle-class white people who were not that unlike their own parents, grandparents, etc.
Leftists and left-liberals are guilty of the Islamisation of the UK. It is they who have the power in the universities, the council offices, the churches, the NGOs, the law, and so on. These people have political or social power. They also have the ears and minds of their students and the young. Muslims and Islam have also been helped enormously by the aforesaid cultural and political groups within our society.
Those in charge don't support "minority religions". No. Not ‘religions’ with an ‘s’. One minority religion. Islam. Ask Hindus and Sikhs what they think about all this. Ask those who complained to the BBC about the fact that 4 out of 5 "religious programmes" were about Islam. Ask them where council funding is going. Not to Sikhs or Hindus or Jews. To Muslims. Ask them who is and who's not represented in the council chambers of the UK. Muslims are. Hindus and Sikhs are not.
These are some of the reasons why Christianity is dying. It's to do with things like the suicidal tendencies of the Anglican Church. Just think about the case of the Rev Ray Gaston, formerly of Respect... sorry, of Birmingham. Think about his once "living for a year as a Muslim". Was that supposed to have helped the Methodist or Anglican faith in some way? His being a candidate for the Muslim and Pakistani Respect Party can’t have helped Anglicanism or Methodism much. His very close relationship with IslamoTrotskyists like Salma Yaqoob won't have helped much either.
Now these are the real reasons why the Christian religion is dying. They're also why the beast of Islam is feasting and burgeoning on the death of everything but itself.