[The] determination to build Jerusalem, at once and on the spot, is the very force which is responsible for the intolerance and violence of the new political order � if we believe that the Kingdom of Heaven can be established by political or economic measures � that it can be an earthly state � then we can hardly object to the claims of such a State to embrace the whole of life and to demand the total submission of the individual � there is a fundamental error in all this. That error is the ignoring of Original Sin and its consequences or rather identification of the Fall with some defective political or economic arrangement. If we could destroy the Capitalist system or the power of bankers or that of the Jews, everything in the garden would be lovely.
Christopher Dawson (and here), Religion and the Modern State (1935), quoted in Michael Burleigh, Earthly Powers: The Clash of Religion and Politics in Europe, from the French Revolution to the Great War. (As of p. 152, the Burleigh book is excellent.)