Repent America is a Philadelphia-based evangelistic organization that works against homosexuality, abortion and evolution.

Janet Porter is the president and founder of Faith2Action, a Christian advocacy group that works to influence politics and legislation. The group is based in Dania Beach, Fla.

Advance USA promotes Judeo-Christian religious values. It is based in Independence, Mo., and maintains a Washington, D.C. office.

The Unitarian Universalist Association of Congregations works to connect individual congregations with others across the U.S. Contact the executive assistant for the office of the president, Stephanie Carey Maron.

Neil Clark Warren, a psychologist and former dean at Fuller Theological Seminary, co-founded and chairs the eHarmony online dating service. He has written several books about relationships, including Date … or Soul Mate?: How to Know if Someone Is Worth Pursuing in Two Dates or Less.

Christian Piatt is the co-author of MySpace to Sacred Space: God for a New Generation (2007) along with his wife Rev. Amy Piatt. He is an author, editor, speaker, musician and spoken word artist. He co-founded Milagro Christian Church in Pueblo, Colorado with his wife in 2004. Contact through the form on his website.

Mike Hayes is a co-author of Googling God: The Religious Landscape of People in Their 20s and 30s (2007). He is the co-founder of the website Busted Halo and the senior editor of the Googling God blog.

Michelle McKinney Hammond of Chicago is a cable show co-host, public speaker and the author of several Christian books on living single, including Secrets of an Irresistible Woman: Smart Rules for Capturing His Heart and Ending The Search For Mr. Right: How to Be Found by the Man You’ve Been Looking For. She founded HeartWing Ministries.

Connally Gilliam of Arlington, Va., who works for the Christian ministry The Navigators as a life coach for young adult singles, wrote about unintentional singleness in Revelations of a Single Woman: Loving the Life I Didn’t Expect.