Norman Bentwich 
Religious Foundations of Internationalism [PDF ebook] 
A Study in International Relations Through the Ages

This book discusses the relation of different religious systems to the development of world unity, peace and international law. It examines Pagan worship, Judaism, Christianity, Islam and the Indian and Far Eastern religions and shows how far their universalism has made for peace or war. It traces the struggle for religious freedom through the ages and what part religion could and should play in the movement for international peace. At a time when religious fundamentalism and nationalism are once again issues of global significance, this book is as relevant today as when it was originally published.