"true equality could also be no religious holidays. Having only one group's holiday is the Orwellian principle of some people being more equal than others."

It isn't Orwellian to expect that the society that has existed here for centuries should be ready to pull out its roots because these are Christian, to accommodate a small number of new arrivals who object to the culture that is already established here? Our holidays reflect our history and culture. Why such resentment of the established culture you have chosen to come to? 

 I suggested at my workplace that instead of 10 days holiday at Xmas for everyone, everyone should have 10 days to take as they wish. The most horrified response I got was from a secular Jew who liked everyone being off at the same time, rather than sectarian holidays by religion...

I believe now that is correct, shared common secular holidays like Xmas are enjoyed by everyone but a small but vocal group of the intolerant.