It started with him coming home from school full of Diwali celebrations, leading on to 'Mum why don't we celebrate Diwali?' which led into a discussion of Different Cultures, which ultimately, as I suppose it would have to, led into a discussion of religions and 'So which god do we believe in, Mummy?' So I said there was no evidence for the existence of any at all, and while some people believe in them and that's fine, unfortunately some people who believe in them are not fine about it and do bad things because of it. So what I want to get across to him is that he shouldn't be rude to other people about the gods they believe in until he's old enough to have good bunfights on the internet - I've gone with 'Well, you know what your favourite colour is? Other people have different favourite colours, and there's nothing wrong with that.'
Anyone got any more/better suggestions?