There is, of course, a problem here. It can be summed up in the words, "You shall have no other gods before me." It seems that- at least according to the Barna people- Americans have two such gods before Him: family and country.
Biblical and religious illiteracy is, of course, at an all-time high in America and throughout the Western world. In a way, it's not surprising that we're a nation of idolaters. Martin Luther said that our god is whatever we fear, love and trust the most.
Either Barna is wrong, or we as a nation aren't quite clear about the entire concept of "God."