I’ve long come to the conclusion that regular injections of religion in early childhood provide excellent immunisation against spiritual infection in later life. Unprotected children become vulnerable adults who are easily seduced into joining all sorts of weird cults. Going to ‘church’ – whatever the religion – builds up your immune system. If you grow up with sacred stories about good and bad angels who live in heaven and hell respectively, you’re not likely to get carried away by fictional Hollywood films about extra-terrestrial beings. Religiously inoculated adults don’t tend to see flying saucers. You’ve been saved from night visions by repeated injections of ‘ordinary’ faith.