They're rooted in lots of other cultures as well – a reality it takes enormous contortions to ignore.
Polytheistic classical Greek and Roman cultures are the bedrock of British high-status culture. The languages are still taught in schools, texts from that time are used to shape the values of Britain's ruling class ( Boris Johnson trotting out classical tags to show-off), classical architecture has been imitated in the UK for centuries for our major buildings, and classical art is preserved in our museums.
We get much of the English language from Latin and Greek, particularly in the sciences and even our word for democracy. (The US goes one further and refers to its upper chamber as the Senate, populated by the Democrat and Republican parties, respectively Greek and Latin)
Roman Law forms the basis of most legal systems in Europe and in the English-speaking world. Slightly less so in England, but very strongly in Scotland (the British home of that Enlightenment mentioned by PP).
Jury trials in the UK are the legacy of Viking law.
The Romans didn't bring hypocausts to the British Isles because of Christianity. The first Roman Emperor to become Christian, Constantine I, didn't convert till about 312 AD.
And the knowledge of classical mathematics and science, on which the C18th enlightenment was built, was transmitted to northern Europe in the C12th, C13th & C14th by the Islamic scholars of the Mediterranean who had preserved it, assimilated it and added plenty of their own knowledge. Which is why many of our mathematical words like algebra and algorithm are Arabic. Oh yeah, and those Arabic numerals and that zero from India...
Maybe that's why Farage's Brexiteer pals had "had enough of experts"? Perhaps they felt those wretched scientist-y people who could do maths were practising a foreign culture? 