The Second Great Awakening is significant because it changed the character of American religion. Prior to the Revolution, the largest denominations were Puritan descendants known as Congregationalists, Anglicans and Quakers. Following the Revolution, more religions developed, including Methodism and Baptism.
The Second Great Awakening marked a huge change in the way Americans viewed human beings, which was a significant aspect of their religious lives. Early religious groups believed humans were dark and evil, and that only the grace of God could save them.
The religions following the Second Great Awakening focused on humanity's ability to change their circumstances. The basis for this focus was that humans had freewill, and they could assert that will to be 'saved,' which suggested that salvation was available for everyone and not just the elite who could afford it.