CT has published an interesting summary of research by Christian Smith. Some of the “facts” about American Christianity you think you know may not be facts at all.
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R. Scott Clark

R.Scott Clark is the President of the Heidelberg Reformation Association, the author and editor of, and contributor to several books and the author of many articles. He is professor emeritus of church history and historical theology at Westminster Seminary California, where he taught for 29 years. He also taught at Wheaton College, Reformed Theological Seminary, and Concordia University. He has hosted the Heidelblog since 2007 and the Heidelcast since 2009.
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Actually, the article is by Ed Stetzer. It’s a very helpful read.
Hart’s book Deconstructing Evangelicalism has an illuminating chapter on especially Barna’s use of statistics along similar lines.