It is too often assumed that religious heterodoxy before the Enlightenment led inexorably to intellectual secularisation. Challenging that assumption, this book expands the scope of the enquiry, hitherto concentrated on the relation between heterodoxy and natural philosophy, to include political thought, moral philosophy and the writing of history. Individual chapters are devoted to Grotius, the Dutch Remonstrants and Socinianism, to Hobbes, Robert Boyle, Robert Hooke, Dutch Collegiants and English Unitarians, Giambattista Vico, Conyers Middleton, and David Hume. In their opening essay the editors argue that the critical problems for both Protestants and Catholics arose from destabilising the relation between the spheres of Nature and Revelation, and the adoption of an increasingly historical approach both to natural religion and to the Scriptual basis of Revelation. Contributors include: Hans Blom, Justin Champion, Jonathan Israel, Martin Mulsow, Enrico Nuzzo, William Poole, Sami-Juhani Savonius, Richard Serjeantson, and Brian Young.