John Emerich Edward Dalberg-Acton said this quote
“ The theory of the relations between states and churches is bound up with the theory of Toleratio, and on that suject the eighteenth century scarcely rose above an intermittend, embarrassed, and unscientific view. For religious liberty is composed of the properties both of religion and of liberty, and one of its factors never became an object of disinterested observation among actual leaders of opinion. They preferred the argument of doubt to the argument of certitude, and sought to defeat intolerance by casting out revelation as they had defeated the persecution of witches by casting out the devil. There remained a flaw in their liberalism, for liberty apart from belief is liberty with a good deal of the substance taken out of it. The problem is less complicated and the solution less radical and less profound. ”