Leon J. Podles, who lives in Baltimore and in Naples, Fla., wrote The Church Impotent: The Feminization of Christianity (Spence, 1999).

Marcia Y. Riggs is J. Erskine Love Professor of Christian Ethics at Columbia Theological Seminary in Decatur, Ga. She wrote Plenty Good Room: Women Versus Male Power in the Black Church (Pilgrim Press, 2003).

U.S. Food and Drug Administration (FDA) resource about the development and approval of new drugs.

Sally Moran of Charleston, S.C., is the author of a 2004 print-on-demand book, Women of the Covenant: The Case for Female Roman Catholic Priests.

Kenneth Carder is professor of the practice of pastoral formation at Duke University, Durham, N.C., and senior fellow of Pulpit & Pew. He is a United Methodist bishop.

Cynthia Woolever is director of U.S. Congregations in Louisville, Ky., a religious research group that is conducting the U.S. Congregational Life Survey.

Written by Kerry Walters. Walters gives an overview of the history and philosophy of Atheism.

Howard Hendricks is chairman of the Center for Christian Leadership at Dallas Theological Seminary in Texas.

Written by Robin Le Poidevin. Le Poidevin explains agnosticism as an ideology and writes about its history and development.