Is the USA a Christian Nation? William B. Williamson From: Volume 13, No. 2 Spring 1993 ShareTweet William B. Williamson William B. Williamson is emeritus professor of philosophy at Ursinus College, Collegeville, Pennsylvania. He is the editor of An Encyclopedia of Religions in the United States. See more articles This article is available to subscribers only. Subscribe now or log in to read this article.