There is no greater social evil than religion. It is the cancer in the body of humanity. Human credulity and superstition, and the need for comforting fables, will never be extirpated, so religion will always exist, at least among the uneducated. The only way to manage the dangers it presents is to confine it entirely to the private sphere, and for the public domain to be blind to it in all but one respect: that by law no one’s private beliefs should be allowed to cause a nuisance or an injury to anyone else. For whenever and wherever religion manifests itself in the public arena as an organised phenomenon, it is the most Satanic of all things.
– A.C. Grayling, Life, Sex and Ideas