“Perhaps it would be as well, first of all, to try to make out what one means by the word Christian. It is used these days in a very loose sense by a great many people. Some people mean no more by it than a person who attempts to live a good life. In that sense I suppose there would be Christians in all sects and creeds; but I do not think that that is the proper sense of the word, if only because it would imply that all the people who are not Christians – all the Buddhists, Confucians, Mohammedans, and so on – are not trying to live a good life.”
From “Why I Am Not A Christian” by Bertrand Russell.