Examines the evolving relationship between Church and State, the character of radical thought in Enlightenment England, and the nature of that Enlightenment itself. A tribute to the work of the late Justin Champion, this volume explores the radical religious and political ideas of seventeenth- and eighteenth-century England which were at the heart of Champion's intellectual contributions. Drawing on the debates and upheavals that dominated the period from the British Civil Wars to the mid-eighteenth century, the essays in this collection interrogate the challenging relationship between politics and religion which prompted what Champion called a 'Crisis of Christianity'. Diverse perspectives on that crisis are reconstructed, encompassing the experiences of republicans and radicals, philosophers and historians, atheists and clergymen. Through these individuals, a complex discourse which defies easy categorisation is recovered, but which speaks to central discussions concerning the evolving relationship between Church and State, the character of radical thought in Enlightenment England, and indeed the nature of that Enlightenment itself.