A recent survey conducted by Gallup concludes that religion is still very much an important part of America’s social fabric.
Based on data from more than 
Out of all the religious denominations included, members of The Church of Jesus Christ of Latter-day Saints emerged as the most religious of any specific religious group in America.
Other findings include that the percentage of Americans who do not have a specific religious identity has increased. According to Gallup analysts, the findings suggest that religion will continue to play an influential role in American life in the years ahead even if the methods of religious expression and worship change.
Addtional Resources:
Pew Study on Christianity, Religiousity of Mormons
Pew Study: Mormons' Knowledge of Bible