I found this interesting article on Instapaper.com:
From the earliest arrival of Europeans on America’s shores, religion has often been a cudgel, used to discriminate, suppress and even kill the foreign, the “heretic” and the “unbeliever”—including the “heathen” natives already here. Moreover, while it is true that the vast majority of early-generation Americans were Christian, the pitched battles between various Protestant sects and, more explosively, between Protestants and Catholics, present an unavoidable contradiction to the widely held notion that America is a “Christian nation.”
Read more: http://www.smithsonianmag.com/history-archaeology/Americas-True-History-of-Religious-Tolerance.html
Bonus: interesting article about Roald Dahl.