The vast ignorance of American history by far too many Americans is perhaps demonstratedin the failure to understand that it was the free practice of their interpretation of Christianity by the pilgrims that led to the creation ofAmerica. Plymouth colony, established in 1620, put the Atlantic Ocean between them and hostilities they had encountered in England.
To understand the role of religion in America, the First Amendment begins with a prohibition that the states shall make no law “respecting an establishment of religion...” The Founders wanted to make sure that neither the federal, nor state governments designated a particular religion as the only one. We can thank James Madison for that and the other enumerated freedoms.
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What surely has to be a cause for concern in America are the results of a Harris poll released in December 2013. While a strong majority (74%) of U.S. adults said they believe in God, the figure was down from 82% in earlier years. Belief in miracles, heaven, and other religious teachings were all in decline.
If you care about the current state of the United States, then go read the whole thing.