Abstract
In 20th Century America, and in countries of similar political culture, it seemed a permanently established principle that there should be a "wall of separation" between Church and State. But the separation has again become contentious. It is rejected by Muslims and in the US it is under attack from "evangelical" Christians (see Theocracy watch " website). It seems useful to look again at the doctrine of "separation of Church and State", to see what various things the phrase might mean, and what reasons there might be, for and against, regarding at least some of the possible formulations of the doctrine.