“Christendom has often achieved apparent success by ignoring the precepts of its founder.” So begins Protestant theologian H. Richard Niebuhr‘s first book, where he argues the proliferation of Christian denominations has less to do with theological difference than with attachment to class distinctions, racial hierarchy, and nationalism. A plea for unity, and for mission overcoming division, The Social Sources of Denominationalism will be free to all in 36 days. #PublicDomainDayCountdown