I'd like to help you, but I think you need to be a bit more specific. I mean, religion has played a very large role in the development of the US. There's Puritan ideology, The Great Awakening, the rise of Deism, Second Great Awakening, and the spread of evangelicalism, to name a few of the general topics that play into your question. Historians have made entire careers writing about just one of these topics. Can you give us a better idea of what you are asking about?