How do Natural Law concepts in the Social Contract ideas of Hobbes, Locke, and Rousseau change from their Classical, Medieval Christian, and Reformed Christian formulations?

How do Natural Law concepts in the Social Contract ideas of Hobbes, Locke, and Rousseau change from their Classical, Medieval Christian, and Reformed Christian formulations? Be sure to include a discussion of the separation of religious and political offices, toleration of religious pluralism, statesmanship, democracy, and positive law/public policy formation.