You don't need a God to be good, but so much of the concepts of love, respect, and caring for others that are now instilled into the culture, legislation, philosophies and institutions of the UK have been shaped by the doctrines of Christianity which have been in Britain for 1400 yrs.
The importance of these religious doctrines cannot be ignored. They have not always been well managed, but they have still been a major force in shaping the tolerant caring society we have.
Anti slavery movements, prison reformers, all the early child care pioneers, rescuing the Victorian era street children were from Christian organisations. I doubt if we would have achieved the caring and tolerant society we have today without these doctrines.
Some clever philosopher had to think out these moral questions and formulate the ideas into how to build a good society. To whom you attribute these ideas, whether it was a divine being or just a good and clever man is up to you. I am very glad someone did.